Lamont Heartfelt Vanity is the brother of Sincere. These two have traveled up and down the cosmic ladder, and beyond the beyond.

Eve - The Mother of All is the wife of Sincere, even going as far to take his last name. This was not a mutual marriage and it just is because Eve commands it so. As one of the most powerful characters in the franchise (past, present, future, endless) - Sincere has to deal with this.

Xeranthemum is a love interest of Sincere and the mother of their child - Shana. There seems to be some history between the two, which takes place prominently in The Devil's Playground. While her mother does not approve of this relationship, Xeranthemum has chosen to place her heart on Sincere.