Well, even if one admit that isn't her son, I'd gladly help her. But her prey is immortal and that goddamn elixir is permanent, ask Mokou if you have any doubts... and she needs a psychiatrist.
EDIT: after a few tests I had to do, I think I can say, instead of "them", I can say Us
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When I look at your face, it reminds me of my son.Hey, Alice. Won't you become my daughter and take revenge on Chang'e with me?This hair color...It's the same as my son's...