Lady Isabel Kerr (died 1628) (1585–1628) Parents Margaret Maxwell Mark Kerr, 1st Earl of Lothian Children Sir Archibald Douglas William Douglas James Douglas, 2nd Earl of Queensberry unknown Douglas Lady Margaret Douglas Lady Janet Douglas Siblings Robert Kerr, 2nd Earl of Lothian Lady Lilias Kerr Lady Elizabeth Kerr Sir Mark Kerr Lady Margaret Kerr Sir William Kerr Lady Jean Kerr Lady Janet Kerr Partners William Douglas, 1st Earl of Queensberry