I, 35 M, and my wife, 32F, have been married for 14 years. We had a rough start as when we were engaged I went to basic training for the navy and a call home revealed she married a former coworker of mine. They annulled it and I ended up returning home after the forces life didn't work out for me. We've been together ever since and had two children. My wife expressed interest in our roommate (we've never lived alone for financial reasons) so we had a one night three way that blossomed into a throuple. We moved into a place together. We moved our children and her kids too. Then when that relationship fell apart, we fell for another woman (a mutual friend) and moved in with her after the breakup. My grandfather, a man i really respect, has cut me off and accused me of "uprooting my family" and making the kids change school districts whenever we move in with someone else. He doesn't like the fact that we our kids referred to our partners children as brothers and sisters. He was also really upset when my older son (elementary age) mentioned wanting to bring an equalizer on the bus due to bullies blaming the moving and such.

I'm an adult and what my wife and I do sexually is our business. My children love having new siblings (my wife and my girlfriend's children). AITAH?