Sir Thomas De Middleton
Sir Thomas was born about 1380 in Belsay Castle, Northumberland, England.  Sir Thomas is no longer alive.

 Margaret de Heton
Margaret was born on January 13th, 1395 in Chillingham, Northumberland, England.

 Margaret De Middleton
Margaret was born about 1409 in Belsay Castle, Northumberland, England.

 John De Middleton
John was born about 1411 in Belsay Castle, Northumberland, England.  He died in 1478 in Middleton Hall, Kendal, Westmoreland, England.

 Richard De Middleton
Richard was born about 1420 in Belsay Castle, Northumberland, England.

 Peter De Middleton
Peter was born about 1426 in Belsay Castle, Northumberland, England.  He died on April 21st, 1499 in Wakefield, West Riding, Yorkshire, England.