Robert Deane, 1st Baron Muskerry
Robert Tilson Deane, 1st Baron Muskerry PC (Ire) (29 November 1745 – 25 June 1818), known as Sir Robert Deane,
6th Baronet from 1770 to 1781, was an Irish politician.
He was the son of Sir Robert Deane, 5th Baronet of Dromore and succeeded his father in the baronetcy in 1770.
Deane represented Carysfort in the Irish House of Commons between 1771 and 1776 and then Cork County between 1776 and 1781.
He was also appointed High Sheriff of County Cork for 1773 and admitted to the Irish Privy Council in 1777.
From 1780 to his death he was Custos Rotulorum of County Limerick.
In 1781 he was raised to the Peerage of Ireland as Baron Muskerry, in the County of Cork.
In 1783, he was chosen Grandmaster of the Grand Lodge of Ireland, a post he held for the next both years.
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Sir Robert Deane, 5th Baronet
Sir Robert Deane, 5th Baronet PC
(Ire)
(c. 1707 – 7 February 1770) was an Irish barrister-at-law and politician.
He was the third son of Sir Matthew Deane, 3rd Baronet and his wife Jane Sharpe, only daughter of Reverend William Sharpe.
In 1751, he succeeded his older brother Matthew as baronet.
He was invested to the Privy Council of Ireland in 1768 and represented Tallow in the Irish House of Commons from 1757 to 1768.
The following year, he stood for Carysfort, a seat he held until his death in 1770.
On 24 August 1738, he married Charleton Tilson, second daughter of Thomas Tilson.
They had six daughters and four sons.
Robert, the oldest surviving son, succeeded to the baronetcy and was later raised to the Peerage of Ireland as Baron Muskerry, while his younger brother Jocelyn Deane was also a Member of Parliament.

Question: Who is Robert Deane, 1St Baron Muskerry's paternal grandfather?
Answer: Sir Matthew Deane, 3rd Baronet