It appears that J really is struggling with the lack of knowledge he has on his birth mother. Nothing you can do about it at this point but have you looked for good child friendly books on the topic? Have you sat down and agknowledhe his struggle in simple words, talk about how it makes him feel? Probably extremely hard for you to do it but you know him better than any therapist. You will know how to interpret his comments or questions.
J is a very bright child and it appears he would understand if you ask him why he mentions his birth mother when he is angry. Could you maybe tell him how you perceive it: ie. use it as a way to get to you when he is upset with you?
Maybe talk about the multitude of families. About the fact that no one gets to choose their family. Some activities on the good parts and hard parts of his special situation?
Just a few thoughts. Leave it if completely unrealistic.
J is a very bright child and it appears he would understand if you ask him why he mentions his birth mother when he is angry. Could you maybe tell him how you perceive it: ie. use it as a way to get to you when he is upset with you?
Maybe talk about the multitude of families. About the fact that no one gets to choose their family. Some activities on the good parts and hard parts of his special situation?
Just a few thoughts. Leave it if completely unrealistic.