R is the son of Q. M is the brother of B, who is the daughter of Q and the mother of P. How is M related to R?

Let's compile the information to construct a family structure:R is the son of Q $⟹$ R is male, parent is Q.B is the daughter of Q $⟹$ B is female, sister of R.M is the brother of B $⟹$ M is male, brother of B and R.Since R, B, and M are all children of Q, M is the brother of R.