I have a bit of a situation. I'm a 23-year-old heterosexual male, and I am married. My wife and I also happen to have a girlfriend now, making our arrangement a polyamorous triad. We all love each other very much, and we are getting to the point that we are thinking about how we are going to tell our parents about our relationship.
My parents have already been told. Their reactions were as expected: My mother was slightly bemused and amazed that I was able to pull it off, while my father gave me a high five. But my parents are divorced/remarried-to-other-people atheists, and by the time I was 12, my dad was teaching me how to eat pussy. So my situation is not exactly typical.
My wife's family is super Southern Baptist, while our girlfriend's mother is a big ol' bag of crazy: She was a physically abusive nut job who beat her children with a Bible attached to a rope.
Our question is this: Should we even bother disclosing to either of their sets of Bible-beating parents? My mother-in-law is a hypocritical, judgmental bitch, but my wife feels like she needs her approval.
If we shouldn't disclose, then how do we deal with things like family holidays and other group events? Is not disclosing a sign that either my wife or girlfriend is ashamed of the life we lead?
Not Telling The Whole Truth
You don't mention how long you've been in this poly triad, but seeing as you're only 23 and were already married before you met the girlfriend, you can't have been in this poly triad for very long. And while it's nice that you have such an open and honest relationship with your parents — perhaps a little too open (I'd like to take this opportunity to thank my father for not teaching me how to eat pussy when I was 12) — your wife and your girlfriend aren't similarly blessed.
For that reason, I'm gonna advise against disclosing the true nature of your relationship(s) for the time being. Not because you have anything to be ashamed of — you most certainly do not — but because relationships with parents are best run on a need-to-know basis.
And it doesn't sound like your wife's parents need to know — not yet. This triad is new, and like most romantic relationships, it may not stand the test of time. For the moment, introduce your girlfriend as a friend; if your MIL is curious about why you're all living together, say something vague about the economy. If it turns out that your triad is one for the ages, then you can come out to your MIL and weather the judgmental shitstorm.
As for the girlfriend's mother, it doesn't sound like that woman has a right to know anything about her daughter's life.
All that said, I do think loving, committed nonmonogamous couples should be open with their families, if only to prove to people that loving, committed nonmonogamous couples exist. I'm not encouraging you to be closeted, just strategic. Your wife's family is more likely to be accepting if they perceive your marriage as not just loving, but lasting. Give it a few years, and then, whether the current girlfriend is still in the picture or not, your wife can let her mother know — as matter-of-factly as possible — that you're poly.