I need a legal advice regarding property inheritance. My father past away 25 yrs ago. He left the family a properties, a house and a land. My mother right now have cancer. We are 12 siblings. 8 of us wanted to take a loan against our family house to support my mother's health problem, the 4 doesnt want to cooperate. We(8 siblings) wanted to take a loan and make our family house as a collateral. in the title of the house all our names are printed as the owner. my mother having 50% share and the children for the remaining 50% ownership. My mother can no longer sign any documents.
My questions are:
1. Since my mother can no longer sign, can she just signed the documents by using her thumb mark?
2. Can we(8 siblings) sell our share of rights in the house without the approval of the 4 siblings? can they stop us from selling our right? what legal actions can we make so we can sell our right to our family house.