Sir Robert Blackwood, 1st Baronet (November 5, 1694 – 1774), of Ballyleidy, County Down, was created a Baronet of Ireland on July 1, 1763. He was married firstly in 1721 to Joyce Leeson, sister of Joseph Leeson, 1st Earl of Milltown

Joseph Leeson, 1st Earl of Milltown

Joseph Leeson, 1st Earl of Milltown was an Irish peer and politician.-Background:He was the son of Joseph Leeson, who was a brewer in Dublin, and Mary Brice, daughter of Alderman Andrew Brice, Sheriff of Dublin...

, and had issue:

• Sir John Blackwood, 2nd Baronet
  Sir John Blackwood, 2nd Baronet
  Sir John Blackwood, 2nd Baronet was an Irish politician and baronet.He was the eldest son of Sir Robert Blackwood, 1st Baronet. Blackwood entered the Irish House of Commons for Killyleagh in 1761 and sat for it until 1768. He was then returned for Bangor until 1776...
  
  
• Leeson Blackwood, who died unmarried in 1773
• Margaret Blackwood, who married Stewart Banks

He married secondly in 1729 Grace Macartney, only daughter of Isaac Macartney, by Grace, his wife and the sister and heir of John Aldridge, MP for Killyleagh, and niece of Lieutenant General George Macartney, and had issue:

• William Blackwood, who married Susannah, daughter of Thomas Bateman Lane
• Grace Blackwood, who died unmarried in 1824
• Dorcas Blackwood, who died unmarried at the age of 93 in 1833
• Sarah Blackwood
• Ursula Harriot Blackwood, who married Arthur Johnston, of Redemon, County Down, MP for Killyleagh, in 1767