Sir Edmund Deincourt
Sir Edmund was born about 1256 in Blankney, Lincoln, England.

 Isabel de Mohun
Isabel was born about 1254.

 John Deincourt
John was born about 1278 in Blankney, Lincolnshire, England.  He died in Emley, Yorkshire, England.

 Margaret Deincourt
Margaret was born about 1280.