I think it's because all he really is is a big kid himself. He plays with the boys like he was still a boy himself. They watch those dopey farting slobbering guy movies (Dude, where's my car?)
Play video games (they all sit around and watch each other. WHY????) They throw footballs at each other and shoot targets together and eat horrible things covered in ketsup together. He teaches them to use tools and how to cook. How to fish and how to pray. He is a hero to his boys and prince charming to his girl...and you know what? I kinda like him too. Did you know that H.B.?