When Mary was four , Godwin married his neighbour , Mary Jane Clairmont .
Mary Godwin 's mother died when she was eleven days old ; afterwards , she and her older half - sister , Fanny Imlay , were raised by her father .
When Mary Godwin was four , father married father 's neighbour , Mary Jane Clairmont .
Mary Godwin 's mother died when she was eleven days old ; afterwards , she and her older half - sister , Fanny Imlay , were raised by her father .