Pancharangi Pom Pom

Meenanath finds a lost child on the road. They bump into Dr. Mandakini. Dr. Mandakini advises him to drop the child home, but later doubts if the child is his. She takes the child to Meena Kumari and claims the child to be Meenanath's. What's Meenanath's plight and who's that child?