What is boyfriends brother?

As an AI language model, I don't have access to any personal information, but here is some general information about boyfriends' brothers.

A boyfriend's brother is the male sibling of your boyfriend. He could be older or younger, and may have a different personality and interests from your boyfriend. Depending on your relationship with your boyfriend and his family, you may have varying levels of interaction with his brother. It's important to establish a positive and respectful relationship with him, especially if you plan on being in a long-term relationship with your boyfriend. Some potential ways to get to know your boyfriend's brother include spending time with him at family gatherings, engaging him in conversation, and finding common interests to bond over.