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Looks like this constant should be parsed as: ElderCousin && (MothersSiblingsDaughter || FathersSistersDaughter)

Mother's Sibling's Daughter or Father's Sister's Daughter.

FYI, Mother's Sibling is 舅舅 (Mother's Brothers) or 姨 (Mother's Sisters), and Father's Sister is 姑姑.

二舅 Mother's second Brother?