1) is GPA relative of the builder? Any registered property owner can execute a GPA in favour of their spouse, son, daughter, brother, sister or any other relative to manage his property or empowering him to execute any further deed of transfer including conveyance, sale and gift deed".
2) GPAs are not valid transfers of ownership. Only registered sale deeds are.
3) An attorney holder may however execute a deed of conveyance in exercise of the power granted under the power of attorney and convey title on behalf of the grantor.