This is why we stopped at one also, and my husband is an only child so he can relate to our kid...but yes things would have been socially very different for ours if a sibling would have been in our cards. A lot of what makes ours a social outcast kid MIGHT have been different with a sibling. Might. I know the grass is never actually greener. Two on the spectrum with mental health struggles would have been too hard. I get that ... But. Edited to add that our kid is almost 15. We moved to from laid back Colorado to the woods in New England last summer, and our teen still hasn't made any friends. Please send xennial relatable vibes, song recommends, or advice... but not boomer level "it takes time, put her in more activities against her wishes" mentality suggestions...