when your brother is also your uncle either because your mother had a child with your grandfather or your father had a child with your grandmother: the male offspring being your brother; because you share one parent, and also your uncle; because he is the child of your grandparent as well
Ronald: "Hey Bruncle Bob!"
Bob: "Hey my dear ole brephew, Ronald!"
Ronald: "Did you call my Dad this weekend?"
Bob: "You mean my Grandpa? Yep, he said he put you back on his will even after you shot his dog."