Why is it that my first response is to laugh when I see a man with a woman and children?

OK here is the context:

The guy is a duechbag customer at work. He came to the door drunk one night asking me to grab him some pizza. Why wouldn't he come in? Because he had his dog with him. What a moron. Anyway I saw on Facebook he has a girlfriend or wife and 2 children. It just made me burst out laughing inside.