Legal Question in Family Law in India

the courts will decide the custody for the welfare of the child. in case the child's welfare is with mother, it will go to her and in case father is able to prove that he is a better parent, the custody will go to him.

in most of the cases the mom has the right for custody of girl child till 16 years of her age, in case the mom is not able to take care of the custody of the girl child it shall be with dad.

You may refer to a good work on the subject to understand the fundamentals of law. however, usually the custody should remain with mother unless she is declared as 'unqualified' for reasons available on record. The father may get visitation rights.