James FitzGerald, 6th Earl of Desmond
James FitzGerald, 6th Earl of Desmond( d. 1462), called' the Usurper', was the youngest son of Gerald FitzGerald, 3rd Earl of Desmond, and Lady Eleanor, daughter of James Butler, 2nd Earl of Ormond.
James Butler, 3rd Earl of Ormond
James Butler, 3rd Earl of Ormond( c. 1359 – 7 September 1405), was a noble in the Peerage of Ireland.
He acceded to the title in 1382 and built Gowran Castle three years later in 1385 close to the centre of Gowran, making it his usual residence, whence his common epithet," The Earl of Gowran".
James died in Gowran Castle in 1405 and is buried in St. Mary's Collegiate Church Gowran together with his father James Butler, 2nd Earl of Ormond, his grandfather James Butler, 1st Earl of Ormond and his great great grandfather Edmund Butler, Earl of Carrick and 6th Chief Butler of Ireland.
James the 2nd Earl was usually called The Noble Earl, being a great- grandson, through his mother, Eleanor de Bohun, of King Edward I of England.
Joan FitzGerald, Countess of Carrick
Joan FitzGerald, Countess of Carrick( 1281 – 2 May 1320) was an Irish noblewoman, and the wife of Edmund Butler, Earl of Carrick, Justiciar of Ireland( 1268 – 13 September 1321).
She was the mother of James Butler, 1st Earl of Ormond.
Henry Maxwell, 6th Baron Farnham
The Reverend Henry Maxwell, 6th Baron Farnham (1774 – 19 October 1838) was an Irish peer and Church of Ireland clergyman.
He was the son of Henry Maxwell, Bishop of Meath, and grandson of John Maxwell, 1st Baron Farnham.
On his brother's death, he succeeded as 6th Baron Farnham on the 20 September 1838, holding the title for just under a month before his own death.
He married on 8 September 1798 to Lady Anne Butler (d. 29 May 1831), daughter of Henry Thomas Butler, 2nd Earl of Carrick.
They had the following issue:
He was succeeded by his eldest son Henry, who retained the title until his own death in a railway accident.
Henry Butler, 2nd Earl of Carrick
Henry Thomas Butler, 2nd Earl of Carrick (19 May 1746 – 20 July 1813), styled The Honourable from birth to 1748 and then as Viscount Ikerrin between 1748 and 1774, was an Irish peer and politician.
He was the son of Somerset Butler, 1st Earl of Carrick and Lady Juliana Boyle.
Butler held the office of Member of Parliament for Killyleagh in the Parliament of Ireland between 1768 and 1774.
He succeeded to the title of 2nd Earl of Carrick on 15 April 1774.
He died in 1813 at Mount Juliet, County Kilkenny, Ireland.
On 7 August 1774 he married Sarah Taylor, daughter of Colonel Edward Taylor and Anne Maunsell.
Henry Bryant (naturalist)
Henry Bryant( May 12, 1820 – February 2, 1867) was an American physician and naturalist.
He was the grandfather of Henry Bryant Bigelow.
Somerset Butler, 3rd Earl of Carrick
Somerset Richard Butler, 3rd Earl of Carrick (28 September 1779 – 4 February 1838) was the son of Henry Thomas Butler, 2nd Earl of Carrick and Sarah Taylor.
He succeeded to the title of 3rd Earl of Carrick and 10th Viscount Ikerrin upon his father's death on 20 July 1813.
He was married twice, first on 1 September 1811 to Anne Wynne, daughter of Owen Wynne and Lady Sarah Cole.
They had two children.
He married secondly on 12 February 1833 Lucy French, third daughter of Arthur French, Esquire.
They had three children.
Lord Carrick served as an Irish representative peer from 1819 to 1838.
Somerset Butler, 1st Earl of Carrick
Somerset Hamilton Butler, 1st Earl of Carrick, PC (6 September 1718 – 15 April 1774), known as The Viscount Ikerrin from 1721 to 1744, was the son of Thomas Butler, 6th Viscount Ikerrin and Margaret Hamilton.
He succeeded his brother James Butler as the 8th Viscount Ikerrin on 20 October 1721.
Subsequently, he was invested as a Privy Council of Ireland on 14 April 1746.
He was awarded an LL.D. honorary degree by Dublin University on 23 February 1747.
He was created Earl of Carrick (second creation) on 10 June 1748.
The name "Carrick" refers to the town of Carrick-on-Suir in County Tipperary.
It was also the title of his remote ancestor, Edmund Butler, Earl of Carrick (of the first creation).
Ralph Neville, 3rd Earl of Westmorland
Ralph Neville, 3rd Earl of Westmorland( c. 1456 – 6 February 1499) was an English peer.
He was the grandfather of Ralph Neville, 4th Earl of Westmorland.
Thomas Bruce, 2nd Earl of Ailesbury
Thomas Bruce, 2nd Earl of Ailesbury( later styled Aylesbury) and 3rd Earl of Elgin( 1656 – 16 December 1741) was an English politician and memoirist.
He was the son of Robert Bruce, 2nd Earl of Elgin, and Lady Diana Grey.
His maternal grandparents were Henry Grey, 1st Earl of Stamford, and Lady Anne Cecil, daughter of William Cecil, 2nd Earl of Exeter.
His" Memoirs", which were not published until long after his death, are a valuable source for English history in the last quarter of the seventeenth century.

Question: Who is Henry Butler, 2Nd Earl Of Carrick's paternal grandfather?
Answer: Thomas Butler, 6th Viscount Ikerrin