There are (1)The Hindu Minority and Guardianship Act 1956 (HMGA) and (2) Guardians and Wards Act 1890 (GWA). These Acts are to be read together and implemented in the matter of child custody and appointment of guardian for the minor.
The Hindu Minority and Guardianship Act, 1956 contains a provision which lays down that custody of a child upon the age of 5 years should ordinarily be with the mother. However, if you have a strong evidence to prove in court that your brother can take better care of the child; then would it be possible to have custody of the child. However, technically speaking, the courts award the custody taking into consideration the welfare of the child.
thanks.