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Thanks Genealogy

Genealogical tree

The Grindley family have four members who are related to each other.
One of the four is the opposite sex from each of the other three.
Person #4 is person #1's brother or only daughter.
Person #1 or person #2 is person #3's only son.
Person #2 or person #3 is person #4's sister.

Question: How are they related to each other?

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