Are you 18 or older ? And is your mom is Hayaat.
First you have to arrange the death certificate from Nadra for the departed soul.
Secondly you have to arrange the FRC (Family Registration Certificate) from Nadra too. Where they show the tree of whole family like
Person His wife and all his kids.
Have copies of these certificates and visit to excise office. If you cannot visit excise office then find the agent and he can do it. But you need to provide following list of documents.
Death Certificate of Owner & his ID Card (status as deceased in Nadra).
FRC
Original ID cards of all members shown in FRC.
Original file of Vehicle.
If you are under 18, then vehicle will be transfer to your Walida.
If you are over 18 and want to transfer vehicle at your own name, then you must need an affidavit from your mom and all siblings too.