Great-great-great-grandchild's son.
great-great-great-great-grandson.
by Simaduria July 26, 2024
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step-co-sibling-in-law

Spouse's stepsibling's spouse.
step-co-sibling-in-law.
by Simaduria July 27, 2024
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stepson

Spouse's son and other spouse's non-son.
stepson.
by Simaduria July 27, 2024
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grandnephew

Sibling's grandson.
Grandnephew.
by Simaduria July 26, 2024
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half-great-great-grandaunt

Great-great-grandparent's half-sister.
half-great-great-grandaunt.
by Simaduria July 26, 2024
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co-sister-in-law

Spouse's sibling's wife.
co-sister-in-law.
by Simaduria July 26, 2024
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stepsibling

Parent's stepchild and stepparent's child simultaneously.
stepsibling.
by Simaduria July 27, 2024
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