Love in the Time of Custody

Rohan (23) has been living with his girlfriend, Aisha (22), in a rented apartment in Delhi. They have a two-year-old daughter, Sophia. Rohan's father recently passed away, leaving him a significant property in the outskirts of the city. Rohan wants to move in with his family to take care of his ailing mother, who has been raising him single-handedly. However, Aisha is strongly opposed to this idea as it would affect her custody of Sophia. Aisha threatens to file a case under the Hindu Minority and Guardianship Act, 1956, if Rohan does not stay with her. Rohan's mother is not keen on taking care of Sophia full-time. What legal remedy applies in this situation?

(Note: This is a hypothetical scenario and not based on any real-life events.)