What is a brother in law?

A brother-in-law is the spouse of one's sibling. They are not blood relatives, but are considered to be part of the extended family. In many cultures, the relationship with one's brother-in-law can vary in closeness and importance. Some people have a close and friendly relationship with their brother-in-law, while others may have a more distant or strained relationship. Brother-in-laws can play a variety of roles in a person's life, from being a close friend and confidant to simply being a member of the family. It is important to establish and maintain positive relationships with one's brother-in-law, as they are an important part of the family dynamics.