How did this happen?

Two grandmothers, with their two granddaughters;
Two husbands, with their two wives;
Two fathers, with their two daughters;
Two mothers, with their two sons;
Two maidens, with their two mothers;
Two sisters, with their two brothers;
Yet only six in all lie buried here;
All born legitimate, from incest Clear.
How might this happen?

Click here for the solution

If two widows had each a son, and each widow married the son of the other and had a daughter by the marriage, all the relationships will be found to result.

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