my dad went into the hospital and over the course of two weeks. while in there they realized he had stage 4 cancer and he passed away. they had him on morphine for the pain he was in. my grandparents hired a lawyer to have my dad create his will leaving them and my uncle his houses. this was done 5 days before he passed and he was in really bad shape. is the will legal or can i fight them that he was not of sound mind. they took both his houses and his truck that he said he was leaving to me. what can i do to stop them from taking everything that should be coming to me as his sole heir. i am only 18 and don't have a lot of money to fight them.