Lady Mary Stewart Peerage person ID=107968 Parents Margaret Graham, Countess of Menteith Robert Stewart, Duke of Albany Children Sir William Abernethy of Saltoun, younger Siblings Murdoch Stewart Lady Joan Stewart Isabelle Stuart Lady Marjorie Stewart Lady Margaret Stewart NN Stewart, of Albany Lady Beatrice Stewart Lady Janet Stewart Margaret Drummond, Queen of Scotland Lady Elizabeth Stewart John Stewart, Earl of Buchan Andrew Stewart Sir Robert Stewart Partners Sir William Abernethy, 6th of Saltoun