I don’t particularly get on with my sister, she doesn’t treat me very nicely at all and I wouldn’t say I have benefitted from the sibling relationship
I think if we were to have a second/third DC it would literally be so they had siblings to get along with in childhood and be there for each other when adults. Obviously from personal experience this isn’t a guarantee
DH is an only child so if we didn’t have multiple children, DC wouldn’t really have any family of similar age. This is my only - but significant - worry. I love the baby stage and would have a thousand babies, but babies only grow up. In an ever expensive world we could give DC so much more, focus, space in the house, opportunities and experiences if they didn’t have any siblings. Selfishly we could afford nice things for us too.
Did you get along with your siblings and therefore have multiple children? Did you not get along and therefore choose to stick at one? Or did it have no bearing at all?