Does the tendency to share things come naturally? How do the people with siblings differ from people with no siblings in this department?

I am a single child. And I have to admit, I do not like sharing at all.

Some say it is because I am a single child. But I beg to differ. I believe it is in my nature to not like sharing things.

What do you guys think?

Does the tendency to share things come naturally? How do the people with siblings differ from people with no siblings in this department?
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