Robert de Lumley
Robert de was born in 1272.  He died at the age of 53 on July 20th, 1325.

 Lucy de Thweng of Ingmathorpe

 Marmaduke de Lumley
Marmaduke de was born on September 4th, 1314.  He died at the age of 51 on September 26th, 1365.