It's obviously not them personally or he'd be dead, but I can't imagine too many people on this side casting Dark magic. In fact, the people that could wouldn't care about someone like Monty.
Can I say that's a very stupid idea? If it is indeed my uncle's doing, and again everything would indicate so, bringing him to your house is the last thing that you should do. That's probably the least safe place, for all involved, not when he has access to the place. Hell, he wouldn't even have to go there. He could just tell you to do it and then where will you be?