Welcome to our forum.
It sounds like you, M, and Blue have a great V relationship. Often poly (even monogamous) relationships can be a little rocky in the early years, so I think you're pretty fortunate. I'm in a similar V relationship (MFM), and we did have our rough years, but things are smooth now and it seems very worth it.
Sorry to hear your families are having some health issues with old age. I hope the three of you pulling together will lessen that burden.
Glad you could join us on Polyamory.com,
Love means never having to say, "Put down that meat cleaver!"