Margaret Catherine Blackwood (died 1846) (1771–1846) Parents Sir John Blackwood, 2nd Baronet Dorcas Blackwood, 1st Baroness Dufferin and Claneboye Children Sir Robert Dallas, 2nd Baronet Marianne Dallas Siblings Henry Blackwood Dorcas Blackwood Robert Blackwood Price Blackwood Leeson Blackwood James Blackwood, 2nd Baron Dufferin and Claneboye Hans Blackwood, 3rd Baron Dufferin and Claneboye Anne Blackwood Sophia Blackwood John Blackwood Partners Sir George Dallas, 1st Baronet