Am I in the wrong?

Hi I’m looking for some nice human beings to tell me it’s not normal for after a 4 year relationship ends, for the man who raised your child since 1.5 to just drop him and forget but continue to raise our biological son in front of his face and not be fair. I’ve got his family in my ear saying “you’re the past so your son is the past” “we loved your white baby but you’re too much stress” when all I’m trying to get is my son to be spoken to when he calls. Rather than straight up be ignored. How am I supposed to tell a 6 year old his real “father” beat us and I don’t know his whereabouts nor want them, and the “man” who stepped in doesn’t want responsibility anymore? This feels like physical pain to my heart for my child