Andrea Steiner’s mother

Then she had put a stop to it, first popping his balls, one after the other, with one of her mother’s knitting needles, and then putting that same needle, red and dripping, in her rapist-sire’s left eyesocket. The balls had been easy, because he was sleeping, but the pain had been enough to wake him in spite of her special talent.

Andi’s mother is mentioned through the knitting needles Andi uses; her awareness or participation is not inferred.