mental harrasement

Sir i am living in a home earlier owned by my grandfather..then after his death it was owned by my grandmother....then my grandmother and my 3 paternal aunts left their shares and signed the residence in favour of my father( who opted for bank loan and constructed 1st floor on which i m currently living with my mom and brother)..now the clear situation is this that my father is no more but he transferred his will,intekaal etc in favour of my mom..but my grandmother is continuously harrasing me and my family on the basis that ground floor is hers not ours..she gave 1 room on rent on ground floor which she sometimes handover to some cheap pg boys or cheap families...the renters then mixed up with my grandmother and passed taunts on us..we r vry much upset..nw i m going to marry in few months..so we decided to sale the house..is it possible to do that...can my grandmother ask for her and hers daughters share..if we sell the house..does she have the legal right(sympathy basis) on home now when the property is in the name of my mother...