Puzzle

Two Grandmothers with their two granddaughters;

Two Husbands with their two wives;

Two Fathers with their two sons;

Two Mothers with their two daughters;

Two Maidens with their two mothers;

Two sisters with their two brothers;

            Yet only six in all lie buried here;

            All legitimate born, from incest clear.

                        How can this be?

The answer to this is given in the next blog.