His adopted daughter Pinky is married to Rakesh Roshan, making him Hrithik Roshan's maternal grand father. He belongs to the famous Khan-Roshan family.
Director J. Om Prakash managed to include into his 1980 film "Aasha" the first screen appearance of his grandson - future Hindi film superstar Hrithik Roshan, then aged only 6 - by shooting him in a music interlude without the boy's knowledge.
J .Om Prakash's wife and director Mohan Kumar's wife are real life sisters.
Also known as J. Om Prakash Juneja.