Thomas De Bourne
Thomas was born about 1310 in Yorkshire, England.  Thomas is no longer alive.

 Isabel De Gras
Isabel was born about 1314 in Yorkshire, England.  Isabel is no longer alive.

 Isabel De Bourne
Isabel was born about 1336 in Studley, Yorkshire, England.  She died on August 13th, 1431 in Studley, Yorkshire, England.