Kevin 's future wife was Ben 's cousin but not Gwen. when Kevin was escaped from nullvoid for 3rd time he was go to Saturn colony there he saw Lucy. Both of them fall in love with each other at first sight. Both of them live in the house where Lucy live there lonely before Kevin came. one day she proposed to Kevin but he didn't forget Gwen so he refused . But after some days Kevin also proposed to Lucy, then they get married . Then Lucy got pregnant. But Kevin was arrested and put into nullvoid by Ben. It made him to make revenge on Ben so only they became enemies in the (episodes Ken 10) Meanwhile Kevin was in the nullvoid, Lucy was dead. Their own son name is Devlin levin. He was with his grandparents (Lucy's parents) after they were died Devlin met Ken and join with Tennyson family (as seen in the episode Ken 10)
when Kevin go to nullvoid, Gwen married Albedo (in next story I'll explain)