I'm going to stop talking to my grandparents after they refused to house me.
Would they be sad if you stopped talking to them?
It doesn't matter I don't care.
Your grandparents must have a good reason to refused you. Talk to them about it and try to find out. Maybe you can help and have them house you.
They are old, I doubt they understand how the world works anymore.
No matter how you feel about the situation, they are your grandparents and you should respect their wishes.