answer to Voldemort/Harry's blood: in GoF when Wormtail brings Voldemort back to power, he uses Harry's blood (forearm) and the bone of Tom Riddle Sr. and his own hand. Dumbledore was all excited when he realized Voldemort had Harry's (Lily's) blood in him.
Slytherins played a part with Severus giving his life to aid the Order.
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Slytherins played a part with Severus giving his life to aid the Order.