Wow Rose, that IS an interesting question. I would imagine if the child was neglected or abused in some way on top of being adopted it could cause that person to wonder about not being wanted somehow even more.

I had a good friend for many years and she was adopted. She was close to her father, but the mother was not a really loving mother, kind of all business like. I always remember her talking about her mother as being kind of cold, but as I said her father doted on her.
She had a sister that was adopted too, there were no natural children in the mix.
I think it depends on how much love and nurturing is there as I said.

It is a good question, did you search it online?

Open Eyes