Stop in for a cup of coffee

I don't think they ever really asked. They just said hey, we're gonna remodel the old house, it's a house on top of a garage. He kind of went, ok suit yourselves. Then it eventually turned into them moving in. I think it's a good thing as he really could use some nearby help, im ten miles away but with my grandmas health issues, seconds count.

No. They want too but he's not ready to sell.

Haven't brought it up with him really. I'm trying really hard to just avoid a fight/feud etc. especially right before a very public and very large wedding.
whaat happens to the property when grandpa is gone? You did improvements to garage etc. they are plannng to do stuff to the house. You both have time and money in it... need a formal agreement for what happens at estate settlement or you are just avoiding a small battle that ends in family war.