Lil, I believe those who have always been very loved become "entitled" to that love because to them that is the way family is. I would love to sit over coffee with your son, because I do see the good in him from your posts, and tell him about my parents and about how lucky he is to have so much family love. He doesnt know, thankfully, that it can be another way. It has not been his experience.
If he dared to moan about bio. Dad, id tell him he has a great REAL dad in Jabber and that I used to daydream that I was adopted and that one day my real, loving parents would find me.
Lil his story isnt over. You may yet get some great memories. I hope you do. You deserve it.