William "Longlegs" 3rd Laird de Douglas , Sir
William "Longlegs" 3rd Laird de was born in 1240 in Douglas, Strathclyde, Scotland.  He died at the age of 34 in 1274.

 Martha of Carrick
Martha of was born about 1215 in Carrick, Argyllshire, Scotland.  She died before 1255.

 William "Le Hardi" 5th Laird of Douglas , Sir
William "Le Hardi" 5th Laird of was born about 1240 in Douglas Castle, Douglas, Lanarkshire, Scotland.  He died in Tower of London, Middlesex, England.