"Backstabbed", the comic issue packaged with the
2-pack, includes a part where
threathens to activate explosives he left at
's aunt house. Where did that aunt come from? Since most of the Arashikage family are ninjas and she's shown to be just an elderly housewife, I'd guess she's
's political aunt, married to Soft Master, whose affable attitude (at least when compared to Hard Master) would be a match for her.
Or I could be wrong and she could be a family member who, unlike her family, wasn't too keen to martial arts, like
"You were engineered with such potential, Serpentor. But you lack the most important DNA of all... mine."