William (5th Lord Willoughby) De Willoughby

 Joan De Holand
Joan was born about 1380.  She died on April 12th, 1434.

 Margaret (Marjory) De Willoughby
Margaret (Marjory) was born in 1390 in Eresby, Lincolnshire, England.¹   She died at the age of 62 in 1452 in Yorkshire, England.¹