Baron William De Ferriers
William was born on February 28th, 1332.  He died on January 8th.

 Margaret De Percy
Margaret was born in 1332.  She died at the age of 43 on September 2nd, 1375.

 Margaret De Ferriers
Margaret was born in 1347.  She died at the age of 59 on January 22nd, 1406.

 Elizabeth De Ferriers
Elizabeth was born in 1358.