My uncle told me when he passed that his house was going to me my I know he had this down on a will but I'm unsure if he signed can I contest in court

My uncle had 2 properties he left my brother one which he was paying rent on and when he passed it was to be his and the house my uncle was living in was supposed to go to me my dad and other uncle are still alive and were aware that this was my uncle's wish but I dont think he signed will but it was written up that way but he passed suddenly before actually signing as far as I know is it possible to argue this with my dad and other uncle if it goes to probate mind you they were aware these were his wishes