I'm new to this.
My Father passed away recently. He had made a will leaving us with a third each of money and house. Does a will have to go to probate?
I have 1 sibling that never moved out of the house and lived out of my parents pockets because he never worked. H e has 2 children who live with there Mother. He is the only one living in the house.
Can he stop the sale of the house?
The will has to go to probate, yes. Ultimately your brother cannot stop the sale of the property ( assuming he does not suffer from any disability and was not given an exclusive right of residence- although even at that he would find it very difficult) however he can delay it, make it very difficult and costly and force you to take a court action in order to do so.