Brothers are an important part of the Bible... after all, Jesus referred to those closest to Him as His own brothers. There are many literal and figurative mentions of brothers in the Bible.
We should treat everyone in our lives as brothers or sisters. It is important to love people, treat them with respect... and in essence, treat them all as our own family.
Read these Bible verses about brothers if you'd like to know more about how you should interact with people in your life.