User blog comment:Ankit09/Is artemis spying on young justice?/@comment-3439779-20110218024200/@comment-1747822-20110314060912

Her being Sportsmaster's daughter is highly applicable. A way to explain she's Cheshire's sister is that Sportsmaster had married Artemis' mom, but after finding out the truth about Sportsmaster he paralyzed her legs and left. Then, he met Cheshire's mother, and had a child with her, A.K.A Cheshire. That way, they are half-sisters. :)