Besides those who were regulars at acting,there were many pre-eminent names who acted in just one or two films,either to oblige kith and kin as convenient stand-ins for cameos or only for a lark. Heres an alphabetical list
AAMIR Khan acted as one of the three kid brothers who are separated in his uncle Nasir Husains Yaadon Ki Baraat (1973) followed by his father Tahir Husains Madhosh (1974)
Dharmendra just called son Bobby Deol on the sets of Manmohan Desais 1977 Dharam-Veer and told him to get into costume and do a single scene with a cardboard axe!
Hrithiks first on-screen appearance finds him dancing with Jeetendra to the hit song Jaane hum sadak ke logon se in his grandfather J.Om Prakashs blockbuster Aasha (1980). He then acted in his father Rakesh Roshans Aap Ke Deewane and Bhagwan Dada.
Imran can be spotted as the young Aamir Khan in both Qayamat Se Qayamat Tak and Jo Jeeta Wohi Sikander. His grandfather Nasir Husain produced these films and uncle Mansoor Khan was the director.
Neil Nitin Mukesh
Neil was seen playing Rishi Kapoor as a child in Yash Chopras Vijay and in Jaisi Karni Waisi Bharni seemingly just for a lark.
V.Shantarams daughter did a small role in his 1953 film Subah Ka Tara as Baby Rajshree
Randhir Kapoor & Rishi Kapoor
The two brothers and their sister walked across the frame during the song Pyar hua ikraar hua in their father Raj Kapoors Shree 420.
In his fathers Reshma Aur Shera (1971),Sanjay Dutt was a child member of a group of qawwals!
Tanuja did a brief role in her mother Shobhana Samarths Hamari Beti (1950),which also marked the debut of her sister Nutan in the lead. She later acted in one more film,Amber.