As per your submission it reveals that this is a matter of partition and separate possession as per Hindu succession Act
Your mother and you can claim partition and separate possession in ancestral coparcenary ancestral as per Hindu law
The share of your father would devolve between his legal heirs
For advise please mail me on
You mother will be entitled to only that part of share which your father got after division of ancestral property. For any further assistance, feel free to contact me on my e-mail "firstname.lastname@example.org"
Shubham Pabbi & Associates