1) it is not necessary that property should be solely in your name . it is sufficent if property is in joint names including yours
2) your brother can execute sale deed in your favour to transfer 50%share in house in your name .
3) in the laternative your brother can execute gift deed / relinquishment deed in your favour
4) however you would need bank consent for transfer of house solely in your name .
5) please note that no third party rights can be created during pendency of loan without bank consent