I'm going to let my uncle potentially go homeless
Why do you want to let your uncle go homeless?
He's an ungrateful person. He once said that my family sucks.
It sounds like your uncle can be difficult and that is a shame. However, he is still family and it is expected that family look out for each other.
It is a shame, every family has one of these people in it. My Uncle is our black sheep.
He may be the black sheep of your family, but being homeless is extremely dangerous. Forcing him to live on the streets can have severe consequences for him. It would be best to try to support him and help him get back on his feet rather than make him homeless.