Everyone knows such couples. I love statistics, but my own experiences and observations are just as valuable.
I knew a lesbian couple in my neighborhood - fits very well the description here. As a kid, I always wondered why the children in the house were so troubled.
I know a homosexual male couple raising two adopted children now. The main “dad” is on his 5th live-in boyfriend since he got the kids in a divorce about 6 years ago. The kids are morbidly obese and extremely screwed up.
OTOH, my uncle and my “other uncle” have been together since the sixties. No children tho, that I know of.