Totally random question about bro in law

So I'm super super close to my husband's family. Especially my brother and sister in law. (I only met my husband because of their wedding.) They both call me sis or sissy and I call my sister in law sis as well. As far as my brother in law, my husband's brother, I don't know what to call him. Bro just feels like calling him dude. He really is like my brother, and I love them a ton. What do you guys call your brother? (He's 10 years older than me.)