
Scholars have long known that Darwin's family suffered significant fertility troubles from inbreeding--after all, he did marry his first cousin, Emma Wedgewood!
With more genealogical digging, scholar James Moore recenlty found (according to the times online):
- Darwin's maternal grandfather, Josiah Wedgwood, had married his own third cousin, Sarah, and had eight children.
- The couple's eldest daughter, Susannah Wedgwood, married Robert Darwin, her cousin. Charles was their child.