Roger Ii Demontbegon
Roger Ii was born in 1103 in Lancaster, Lancashire, , England.¹   He died at the age of 46 in 1149.¹ 

 Unknown
Unknown was born in 1111 in Lancashire, England.²   She died in England.² 

 Adam Demontbegon
Adam was born in 1140 in Lancaster, Lancashire, , England.²   He died at the age of 32 in 1172 in England.²