Dhan Daulat(1980)

A wealthy young man (Rajendra Kumar) is forced by his traditional parents to end his relationship with a girl of lower social standing (Mala Sinha). The heartbroken girl never reveals to her lover that she's pregnant with his child, whom she raises on her own. Years later, father and son (Rishi Kapoor) meet when the son finds a job working for a company that his father owns -- but will the two discover the truth about each other's identities?