At least some content in this article is derived from information featured in Harry Potter: Wizards Unite. As such, spoilers will be present within the article.
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The twins were an eccentric pair who lived together in a mansion all of their lives and preferred to keep to themselves. After they died, their relatives discovered that there were two identical copies of everything in their home, right down to the set of hand-written instructions for the Doubling Spell that they each left on one of the pair of matching tables in the kitchen.