Thomas+ Willoughby
Thomas+ was born about 1397.

 Joan+ Arundel
Joan+ was born about 1400.

 Robert Willoughby
Robert was born in 1427 in Parham, Sussex, England.  He died at the age of 38 in 1465.

 William+ Willoughby
William+ was born about 1430 in Dudley, Worcestershire, England.