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?
REVEAL THE ANSWER
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.