I’ve met both types of adoptees. One type that is close to their adoptive family, but still ‘curious’ if not fascinated at the knowledge of having a family link all their own, and still unexplored. Another type may also have been raised by a loving adoptive family, but the child has a personality that leaves them always feeling unsatisfied, and unfullfilled, no matter how nice their new family is. When this second type finally does meet their mysterious ‘missing family’, the sum total feeling is ‘Is that all there is?’
My husband and his twin sister were adopted together. She grew up always wanting to know her biological origins, he did not care. After years of searching, she finally found them and a few months after meeting them for the first time, she packed up and moved halfway across the country to live with them. They keep trying to get us to go visit and meet the whole family, but my husband has not really shown an interest in it.