@jespah,
I'm an only child, now an elder type woman, whose family moved a lot when I was young. What saved me, socially, probably for life, was some child being nice to me, sometimes more than one child. Also, I have liked my cousins, though I don't get to see them much - we do share attachment, never mind that we differ on politics, favorite foods, level of finances, sports teams.
I got involved in work relatively early for a US child, the day I turned sixteen, and work opened my world. I worked in a good hospital, various jobs, through the rest of my schooling years. Work was a kind of family... some of that time.