I can't talk as a mum of 3 as I have only one baby at the moment, and hoping for the 2nd one, but as a sister of 2 brothers.
As my brothers are very close in age, and I arrived 4 years later, there were very close to each others and I was kind of left alone. We didn't really developped a relationship before we were teenagers.
Also, my "middle" brother suffered a lot of his situation, complaining and looking for more attention than us, as we were having a "real" position in the family, the eldest, and the youngest, he was just the middle one, and was very jealous of his 2 other siblings.
My brother also has 3 kids, and the middle one always bring it back to her "middle position" when she is upset, and is developping a very strong character in order to show herself off.
I'm not saying it's like that in every family, it's just my personal experience.
Also, even if Mom2Sofie&Twins has to go through a very special situation with having twins after the first one, I assume her kids won't have the same feelings as they will all have a strong position, the eldest, and the twins.
If I was young enough to have more children, I would have loved to have a big family... and if I had to go for more than 2, I would even go for 4 !
