Robert de Willoughby , Sir
Robert de was born about 1210 in Willoughby with Sloothby, Spilsby, Lincolnshire, England.

 Margaret de Orreby
Margaret de was born about 1210 in Orby, Spilsby, Lincolnshire, England.  Margaret de is no longer alive.

 William de Willoughby , Sir
William de was born about 1230 in Willoughby with Sloothby, Spilsby, Lincolnshire, England.  He died before March 29th, 1300 in Eresby, Lincolnshire, England.