Interesting question.
I am one of 3 and I get on with my sisters.
We weren’t rich, we always had enough food though, and I didn’t feel we were poor, but we didn’t go on foreign holidays or go out for meals, or big extravagances, and I remember my clothes were often hand-me-downs.
I would say mum had enough time for us all, but things were different then, I don’t think parents in those days were as involved with their children’s lives as parents are now. She wasn’t neglectful though.
I am glad of my sisters, they have both been supportive when I have needed it. We don’t see each other very often, or even chat on the phone that much, but we do get together as a whole family a few times a year. I like that my DCs have cousins, I think it’s good to learn to rub-along with people not your own age / interests.
Also it has definitely helped with elderly parents being able to share the burden. But I think we are all quite caring people.
Like others have mentioned, I always know that if there was a crisis my sisters would be there for me. I wouldn’t be without them.
Friends come and go but you always have your family.
From the posts on here it seems that in large families it isn’t necessarily the material things like no foreign holidays or sharing rooms that caused an issue, but where parents had lots of children and were neglectful and didn’t have enough time for everyone that was the problem.
I also have 3 children. Their personalities are very different but as children they have always got along well enough. But we have enough money to do occasional foreign holidays, meals out, extracurricular activities. So none of them have gone short of anything, although we definitely couldn’t stretch to private education!
We have always tried to make time/money for all of them and their individual interests, so I hope there isn’t any resentment when they are older.
I don’t know if they will get along as adults, I hope they do.