Maxwell Stokerman

Maxwell Stokerman is the demititan son of Menoetius and the mortal Stefanie Stokerman. Because he attends Camp Half Blood despite being a demititan, he stays with the Ares kids.

Background
His mother had just gotten married to Charlie Stokerman when Stefanie found out she was pregnant with Menoetius' child. She lied to her new husband and told him the child was his, so they raised him as their own, along with their fully genetic daughters, Ellen and Emily.

After a few years, Stefanie heard about Camp Half Blood from one of Max's teachers, who believed he was a demigod, and she was eager to take him there and tell her husband that it was a recreational summer camp. After Max's first year, Ellen also wanted to attend camp despite being a mortal, and they managed to have both of them stay in camp.