When I was little and used to visit my great-grandparents, I was told that the man who lived with them was a "family friend" or sometimes their "boarder" (he slept in the second bedroom). I didn't find out until I was in my 30s that he was my great-grandmother's boyfriend, after one of my grandmother's cousins told me. Then a lot of things clicked in place in my mind! But I know that I never thought anything strange about them all living together when I was a kid, and no one in my immediate family made it out to be anything weird to us, so we just never paid the situation any mind. This was back in the mid- through late-1960s, btw.
The world opens up... when you do.
Oh, oh, can't you see? Love is the drug for me. ~Bryan Ferry
"Love is that condition in which another person's happiness is essential to your own." ~Robert Heinlein