*Donald 6th Earl of Mar
born about 1240 Kildrummy, Aberdeenshire, Scotland
died after 25 July 1297

father:
*William Earl of Mar
born about 1222 Buchan, Aberdeenshire, Scotland
died before 25 July 1281 Buchan, Aberdeenshire, Scotland

mother:
*Elizabeth Comyn
born about 1223 Buchan, Aberdeenshire, Scotland
died 1267

siblings:
unknown

spouse:
*Helen (Elen) verch Llewelyn
born about 1230/34 Wales

children:
Margaret de Mar born about 1270 Mar, Aberdeenshire, Scotland died before 24 July 1326
Garnait Earl of Mar born about 1272 Kildrummy Castle, Kildrummy, Aberdeenshire, Scotland
died before September 1305
Duncan of Mar born about 1274 Kildrummy Castle, Kildrummy, Aberdeenshire, Scotland
Alexander of Mar born about 1276 Kildrummy Castle, Kildrummy, Aberdeenshire, Scotland
*Isabella (Matilda) of Mar born about 1278 Kildrummy Castle, Kildrummy, Aberdeenshire, Scotland
died about 1320
Mary of Mar born about 1280 Kildrummy Castle, Kildrummy, Aberdeenshire, Scotland

biographical and/or anecdotal:

notes or source:
LDS
ancestry.com
"Biographical Encyclopedia of the Kings & Queens of Great Britain" by Mike Ashley