You would have to sue the grandson based upon Fraud to help your mother regain title to the house. You have to prove that she was not award of what she was doing and the fact that she is illiterate to the extent she could not have formed the legal intent to knowing transfer title the house. You need to do this quick before the grandson does something to affect the property or cause it to be transfered to another person.
Lawyer (JD)
Practing General Attorney, Professor and Lecturer of law for two decades