They're both children of Augustus Furst's third wife, Nadia, and Kaspian, Prince of the eastern European Beast-Men, whom she married after living Augustus Furst two years after their wedding.
They both control an unusual energy, pumping power from an unknown source. She uses it to change her size and phase through object.
She's been married since 1979 to Rex Zorus, the son of an enemy of the First Family, Madame Majestrix. He is now one of its member. Together they had a daughter in 1986, Astra Furst.