Related to an ancestor from a world familiar, these two sisters are grand-daughters to that of an ancient species dubbed as "Boss Monster".
Yeah, Wilbertverse is somewhat connected to the Undertale universe where a familiar male/female Boss Monster has a kid and said kid eventually gets married and has kids herself. With the offspring supporting the durability of an Anthrite and the extended lifespan and powerful magical skills typical of a Boss Monster.
More lore will be sprinkled out eventually with my (horny) posting
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