Thomas de HELBECK
Thomas de was born about 1228 in Great Musgrave, Westmoreland, England.  He died about 1287 in Great Musgrave, Westmoreland, England.

 Avice de MUSGRAVE
Avice de was born about 1238 in Great Musgrave, Westmoreland, England.  She died after October 1289.

 Gundreda de HELBECK
Gundreda de was born about 1256 in Warcop, Westmoreland, England.