Gift ideas for bfs brother in law?

So every time I go over to my boyfriends house, I talk to his sister and we've become pretty close. But her boyfriend doesn't really talk much, he's just like that. He's talk to me a couple times but not many. I know what to get my boyfriend and his sister for Christmas but I'm not sure what to get her boyfriend or if I should even get him anything since we don't really talk? I feel bad not getting him anything because they all live today. My boyfriend said not to worry about it but I don't want to like leave him out. Any ideas?