Joan was the daughter of sir John KG d'Abrichecourt and Maude de Grey. The date and place of her birth have not been found.
She had two marriages/partners. Her first husband was sir John Cokayne. They were married, but the date and place have not been found. They had no known children.
Her second husband was Hugh Willoughby. They were married, but the date and place have not been found. They had no known children.