That isn't him asking his mother about Yoitsu. It looks like he was spending the night at a resting place for travelers. The mother was telling her son stories, and he was sleeping next to them (notice the bed with the jacket on top of it next to them, and the cut to Lawrence in bed right after that) and overheard them. This occurs some time before he meets Holo, and so that is how he knows about it.
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