Amitabh Bachchan - Abhishek Bachchan   

"Big  B" and "Small B" stand, both literally and figuratively, for Amitabh  Bachchan and Abhishek Bachchan respectively. Amitabh is walking tall.  Abhishek is... well.., tall! Amitabh is an icon. Abhishek has married an  icon! Amitabh adores his son. Abhishek deifies his dad! Never has  Bollywood seen a Baap-Beta who are more mutually agreeable than Amitabh  and Abhi. So much in agreement with each other that they even reversed  roles on screen: Amitabh as "Munna" and Abhi as his "Paa"!
 
Rakesh Roshan - Hrithik Roshan 

Rakesh  Roshan, during his acting days, was so in awe of a fast tune that he  would immediately order a steed! He would ask his leading lady to mount  it ("Tum se Badhkar Duniya mein" -'Kaamchor') and let the horse trot to  the tune. Or, he himself would take the reins and let the graceful beast  gallop its way to glory ("Hanste Hanste Kat Jaaye Raste"- 'Khoon Bhari  Maang')!
In one of the greatest Chromosome(atic) surprises ever in  Bollywood, and as an answer to the heartrending prayers of the Roshans,  Rakesh was gifted with a "beta" who could dance like the devil! They  called him Hrithik, and the rest is His Story!
Dharmendra - Sunny Deol - Bobby Deol 

Dharmendra,  the "jat yamla, pagla, deewana", was born with two left foot, but won  hearts with his absolutely marvelous comic timing and one of the most  attractive smiles of all times! Sunny, his first born, "bilkul apne baap  par gaya hai". When he's not waging war with his dance choreographers,  he is seen screaming out his jingoistic lines to the camera! Bobby, the  second Deol, is like home-grown lavender. His on-screen ways are  predominantly Deol-ish but there is a North Mediterranean aspect about  his facial architecture. And Papa Dharam was the first to go to print  with this observation. He referred to Bobby as "my Italian son".
Feroz Khan - Fardeen Khan 

Feroz  Khan, in his heydays, played the "Indian Cowboy". This mutant character  roamed Indian villages in Wild West costumes and shot and killed at  will. Even at the heights of the Bachchan phenomena, Feroz Khan  plundered the B.O with his brand of escapist stuff. Mostly, he played  the fearless on screen, and usually named his character "Rajesh" (king  of kings). His son, Fardeen, has not, so far, had an impact on screen.  After having debuted with 'Prem Agan' (a Feroz Khan production), Fardeen  got relegated into playing rank characters. The most memorable of his  on-screen moments has been the one in RGV's 'Bhoot', when he screams his  heart out after seeing the apparition of the woman his character had  murdered!  
  
Sanjay Khan - Zayed Khan 

Sanjay  Khan, with a Rahul Dravid-meets-Sam Neil face, made his B'wood debut in  1964 ('Haqeekat'). He went ahead with the Chocolate Boy routine, and  vanished from the scene after 'Abdullah' (1980). Sanjay resurfaced in  1990, wielding the great sabre of Tipu Sultan! He got severely burnt in a  fire accident on the sets of 'Tipu...' and had to rush through the rest  of the Sultan's heroic tale, with a sob! Sanjay's son, Zayed, made his  debut with 'Chura liya hai tune jodil ko' and made a mark as the loony  half-brother of SRK in Farah Khan's 'Main Hoon Na'. At his best, Zayed  looks like an evolved cousin of cricketer Ishant Sharma. At his worst,  he is as he was in 'Main Hoon Na'. Both father and son refuse to either  be counted in or evaluated as actors.
Prithviraj Kapoor - Raj Kapoor - Rishi Kapoor - Ranbir Kapoor 

Kal,  Aaj, Kal aur Aajkal! For the Kapoor Khandaan, History is a long-winding  sentence that demands to be punctuated by a Kapoor once in a while. The  Kapoor echo, it seems, will resonate till the end of time!
Sunil Dutt - Sanjay Dutt 

The  Dutt tale is such a sad assortment of dramatic twists that it looks  almost like a zany B'wood masala plotline. It was Sunil Dutt who played  the first Khalnayak of Indian Cinema, in 'Mother India' (1957). Later,  he married Nargis, who had played his mother in 'Mother India'. The  couple epitomized grace and became known for their patriotic fervor and  social commitment. Sanjay Dutt, their only son, started off as an actor,  with 'Rocky' (1980) but soon became synonymous with drug abuse and  alcoholism. Just when he seemed to stage a comeback, Sanju was jailed  under the Terrorist and Disruptive Activities Act (TADA), for having  possessed illegal weapons. His conviction coincided with the release of  his movie, which was titled 'Khalnayak'! Sanjay keeps on leading a life  of trials and tribulations.
Jeetendra - Tusshar Kapoor 

The  Jumpin' Jack of Bollywood was known for his ebullient/effeminate  dancing, which got elevated to the status of a dance form, and is  spoofed even today! Tusshar Kapoor is not as abnormal a dancer as his  dad was. As actors, however, it is tough to ascertain who the winner is!  It's Deadpan vs Underacting!
Pankaj Kapur - Shahid Kapur 

Both  Pankaj and his son believe that a 'u' can deliver what an 'oo' cannot.  They are the Kap'u'rs of Bollywood! Pankaj is a "powerhouse of talent",  thanks to movie review nomenclature. One of his famous acts has been  that of the carrot-gobbling detective, Karamchand. One can easily cast  Pankaj in the role of a scheming n' perverted political dalaal, and go  to sleep while the cam is on-- the senior would "live" (thanks again to  review nomenclature) the character. His son, the cherubic Shahid, is the  exact opposite. This, again, is a chromosomatic Kareena... sorry..  Karisma!
Vinod Khanna - Rahul Khanna - Akshaye Khanna 

Vinod  Khanna has been Bollywood's favourite "Had it been... it would have  been" boy, for he left his supposedly flourishing career to play  real-time chauffer to a demi-god. Disillusioned, desperate and nowhere  near Enlightenment, Vinod staged a half-hearted comeback in the mid  eighties, but found himself to be the dampest squib around. His most  memorable comeback sequence could well be the Daya-less smooch he shared  with Madhuri Dixit, in 'Dayawan'! Vinod produced a mega-debut vehicle  for his son Akshaye, which was, quiet smugly, titled 'Himalayaputra'  (Son of the Himalayas). It bombed at the B.O; Akshaye somehow survived  the crash to make a living as an actor. Rahul Khanna preferred to be the  plum on parallel cinema cakes and went on to become the darling of  crossover filmmakers. Akshaye inherits his dad's narcissist streak. As  for Rahul, he does have a penchant for smooching!
Suresh Oberoi - Viveik Oberoi 

Suresh  Oberoi's was not a particularly observed presence on the Bollywood  mainstream screen of his times. But his voice surely was heard! Even  when he was playing a face in the crowd, Oberoi's voice had the ability  to pierce the heart of all contemporary acoustic arrangements, provided  he had at least one line written for him, on the screenplay. His most  memorable mainstream character has been the one in Amitabh Bachchan's  'Laawaris' -- that of a brave peasant rendered Thakur-ish (arm-less,  that is) by the villain (played, of course, by Ranjith). Viveik Oberoi  started off well, with an impressive performance in RGV's 'Company', but  lost steam and started behaving like a celebrity sans sentience. Rumour  hawks had claimed, recently, that Vivek Oberoi and Suresh Oberoi have  had a domestic duel. "Everything is fine in the family," says Viveik.
Rajendra Kumar - Kumar Gaurav 

Rajendra  Kumar was the Sixties' "Jubilee Kumar", for a number of his films  celebrated golden jubilee at the B.O. But Madame Luck refused to pass on  the baton to his son, Kumar Gaurav, who (after a dazzling debut in  1980's 'Love Story') ran into a storm of flops and got thrown into  oblivion.
Manoj Kumar - Kunal Goswami 

It  was a time when Dilip Kumar, Raj Kapoor and Dev Anand were selling  Pathos, Ethos and Bathos respectively on screen. Harikishen Goswami aka  Manoj Kumar, after many failed attempts at doing the conventional B'wood  romantic, stumbled upon a brand new genre that was untapped till then:  Nationalist Cinema! After reaping considerable success in the beginning,  Manoj Kumar films began to deteriorate in terms of both technique and  telling. As an actor, Manoj began falling prey to zany mannerisms. In  his later films, he decided to cover his face with his hand in both mid  shots and close-ups, perhaps as a cinematic lament on the degradation of  his land, the glory of which he had so trenchantly celebrated on  screen, in his youth. But the critics of his age and beyond failed to  see this as a brilliantly introspective interpretation, and took it as a  typical case of on-screen quackery. His screenplays too had lost their  appeal by the eighties. Manoj, then, made a desperate attempt to  auto-bequeath the "Mr. Bharath" image to his son, Kunal. He produced and  directed the multi-crore biggie, 'Jai Hind', just to project his issue  as the new jingoistic oracle of Mother India. The film failed miserably  and the dad and the son have been silent ever since. Flags down, that  is!
Mithun Chakraborthy - Mimoh 

Mithun,  the "Bengali Babu", literally crossed India and landed in Bollywood! He  forgot his Naxalite days and captured the imagination of the nation by  explaining the meaning of "D-I-S-C-O" (prelude to "I am a Disco Dancer"-  'Disco Dancer'-1982)! Mithun's career is interspersed with three  national awards for the best actor. And the rest of it is populated by  inane/mundane B-grade masalas.
Mithun, according to his fans, was a  great action hero. His detractors, however, called him "Poor man's  Amitabh Bachchan". Mithun was noticed for his dance, and his favourite  dance step was "Watch-as-I-plough-the-earth-with-my legs". Mithun  launched his son in a movie titled "Jimmy" and brought back Raj N SIppy  from his creative grave to direct it. Mimoh, like a keyed automaton,  danced with fury and remained clueless for the rest of the (screen)time.  The desperate dad is reportedly planning a second coming for his  desolate son.
Dev Anand- Suneil Anand 

If  you have a dad who is younger (in heart and mind) than you, you have no  other option than to age ungracefully! No, we are not discussing  Balki's 'Paa' here. It's on Dev Anand and his son Suniel Anand. To those  of you who go to films to gobble popcorn, Suneil Anand could very well  sound like a pre historic entity while Dev Anand would still be counted  in as a persistent oldie trying to be young. The credit for this should  go to Dev Anand, and that devil-of-a-debut that he gave his son: 'Anand  aur Anand'.