For most adoptees, the fantasy of his or her birth family is pretty natural. Most thoughts are just harmless fantasies or maybe a way for a child to deal with being adopted. This by itself does not mean that the child is having serious issues with being adopted. A child could be fantasizing that his or her birth family is not aware that they have been adopted. The thought that he or she was lost by the birth parents, or the birth parents just left him or her for a short time and will come back for them. It is easier for the child to think of than the truth that he or she was given up for adoption. This could last a few days or a couple months until the child is able to come to terms with their birth parents giving him or her up for adoption.
It can also be natural for an adopted child to dream that one of his or her birth parents is a famous person. That the birth parents are searching for he or she and will come for the adopted child one day now that they are able to care for the child. The dream or fantasy of the child can be very simple or complicated based on his or her need to deal with being adopted.
Not all adoptees go through this process when he or she learns of being adopted and starting the journey of working through being adopted. Every child will have his or her own way to come to terms and find his or her way to deal with being adopted. The journey that an adoptee finds his or herself facing, about their adoption is a very private thing and each journey is a personal thing based on their feelings, thoughts and experiences. Allow the children time to come to terms and deal with the fact that he or she is adopted.
Understanding Adoption: A Developmental Approach at adoption.com