William Ross
William was born about 1249.  He died after 1300.

 Euphemia de Balliol
Euphemia was born about 1249.  She died after 1300.

 Hugh de Ross
Hugh was born about 1275 in Scotland.  He died in 1333 in Battle of Halidon Hill.

 Isabell de Ross
Isabell was born in Sanquhar, Dumfriesshire & Barmuckity, Elgin, Scotland.  She died after 1334.