Need to sort some connection for Benevolence because she is pureblood and probably related to someone but nothing in stone.

Up a some generations from Cygnas black

Hephaestus Black -2nd son
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Ephram Black
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Malachy Black
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Emily Black
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Samuel St. John Black

SO down into Phineas
Cygnus great Grandfather is Hephaestus older brother
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His Father
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His Father
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Cygnus black