Who's your real mom?

"'Elvi, which one is your mom?' 'They're both my mom.' 'But which one's your real mom?' When Nicholas wants to know which of Elvi's two moms is her real mom, she gives him lots of clues. Her real mom is a circus performer, and a pirate, and she even teaches spiders the art of the web. But Nicholas still can't work it out. Luckily, Elvi knows just how to explain it to her friend"--OCLC.