Procedure to update the karta in huf (Both in pan, mf and bank)

Hi All,

Wanted to know the procedure to change the karta in Huf for my family HUF. After my father is expired, who is the karta of Huf.

we have lost the deed document.In bank records it has only my father and mother in Huf.Can my mother be the kharta or we need to update the huf deed(as we have lost the deed document).

Is there any way to dissolve the huf.
Kindly advise us.

Thanks,
Maya