I was just having a conversation about "in laws" and my friend and I had conflicting views. Just curious to see what everyone else thinks. To make things easier to explain, let's assume I'm married. So my wifes sister would be my sister in law, and if she got married, her husband would be my wifes brother in law, but does that make him MY brother in law? I say no because there needs to be at least 1 kind of blood connection to use the words brother (in this case, I'd need to go through my wife and then her sister to make a connection to him which seems too far to be anything). He would be my wifes brother in law, but he's connected through 2 marriages so he's nothing to me. My friend says he'd be my brother in law because he's my wifes brother in law, but I disagree that it works that way. Any thoughts? What are the rules?