I agree JRM; he is in fact in a polyamorous relationship as am I. I may have got hung up on identifying the monogamous nature of myself and his partners and did not focus on the larger polyamorous nature of both relationship structures.
I also recognize your accurate description of his "v" relationship which reflects my own. The difference being in " The word "triad" (also, "triangle") is generally used by people within the polyamory "community" to refer to a situation in which three people are each loving, "romantic" and sexual partners with each of the others in the grouping of three. " Which validates sex as a core component in polyamory. Thank you for this clarification.