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Genealogical tree

The Grindley family have four members who are related to each other.
Hints:
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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