Legal heir are both you and your father with equal share in property i.e. 1/2 each. Joint owner.
WARIS (Legal heir Certificate) document just in your father`s name is not proper, Your name will also include in it,
Well, hope it is obtained from local tehsildaar office (revenue office),
Aplly for transfer of ownership (mutation) at corporation office attaching death certificate and WARIS document.
This can be process by anyone through authority letter or by any one of you.
And don`t mention your name in application a surviving heir, as WARIS doc. acknowledge only your father a legal heir.