My Maternal Grandfather built a school and after his death, it belonged to my mother as she was the only heir. However, when my Grandfather died there was this person working as the manager of the school who came to our home on the funeral and told my mother that now she will be the Chairman of the School and made her sign some papers. Now this person is actually one to whom my Grandfather gave shelter and took care of his education since he was a child so he was like family to us and that's why my mother trusted him and signed the papers. Now, after some time we realized that those paper were not the papers for taking the position of Chairman but of resigning from the position, we later realized that the manager was involved with my Grandfather's brother who himself wanted a share in the school and they together planned this and kicked my mother out of the school.
What legal remedy do we have now?