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While ambling about your local cemetery, you stumble upon a grave marker situated before a six-grave plot. Glancing down, you notice an inscription upon the family stone. It reads: Here lie... 2 Grandmothers with their 2 Granddaughters 2 Husbands with their 2 Wives 2 Fathers with their 2 Daughters 2 Mothers with their 2 Sons 2 Maidens with their 2 Mothers 2 Sisters with their 2 Brothers Yet but 6 corpses all lie buried here. All born legitimate, from incest clear. How is this possible?