How can siblings be raised the same but turn out totally different?

[2naSalit]

2. Large families show...

How most siblings are not alike.

I once met a pair of twins who hated each other until they came to a truce as adults but they never got along. I had an extended conversation with one of them and she told me a lot of things about her experience. I thought it was kind of sad, I also realized how hard it must be for twins in general, to have to share their identity with someone else, especially if it's someone you don't like. The same for larger sets of same birth multiples.