Michael's half brother. He never should have been allowed around Michael IMO unless Michael requested it and Michael didn't like AJ or want anything to do with him. AJ never paid attention to Michael when he was living at the Q mansion or spent any significant time with him. AJ had essentially killed Jason Q and was a threat to Michael.
Carly had given AJ the option of joint custody but instead he wanted to keep her at the Q mansion and torment her and continue to ignore Michael.
AJ had a few hours of drunken sex with Carly and never could remember it. To me that qualifies as a drunk sperm donor not a father. Carly wasn't a gold digger and never used Michael's paternity to get money out of the Qs or AJ. She just wanted her kid.
