Robert de Ros of Helmsley
Robert was born in 1124.  He died at the age of 36 in 1160.

 Sibyl de Valognes
Sibyl was born in South Petherton, Somerset, England.  She died after 1212.

 Everhard de Ros
Everhard was born in 1153 in Haddington, Lincolnshire, England.  He died at the age of 33 in 1186.