Question: Who is the paternal grandfather of Connor O'Brien, 2Nd Viscount Clare?

Knowledge 1: Connor O'Brien, 2nd Viscount Clare
Connor O'Brien, 2nd Viscount Clare (1605–1670) was the son of Daniel O'Brien, 1st Viscount Clare and Lady Catherine FitzGerald, a daughter of Gerald, 14th Earl of Desmond.He married Honora O'Brien, daughter of Daniel O'Brien and Ellen FitzGerald, a daughter of the Knight of Glin, and together they had one son Daniel O'Brien, 3rd Viscount Clare, and a daughter Honora, who married John FitzGerald, 13th Knight of Kerry.O'Brien succeeded to the title Baron Moyarta in 1666. [SEP] Knowledge 2: Daniel O'Brien, 1st Viscount Clare
Daniel O'Brien,1st ViscountClare(1577?–1663) was an Irish politician and soldier.He was the younger son of Connor O'Brien, 3rd Earl of Thomond and Una O'Brien.
Knowledge 1: Connor O'Brien, 2nd Viscount Clare
Connor O'Brien, 2nd Viscount Clare (1605–1670) was the son of Daniel O'Brien, 1st Viscount Clare and Lady Catherine FitzGerald, a daughter of Gerald, 14th Earl of Desmond.He married Honora O'Brien, daughter of Daniel O'Brien and Ellen FitzGerald, a daughter of the Knight of Glin, and together they had one son Daniel O'Brien, 3rd Viscount Clare, and a daughter Honora, who married John FitzGerald, 13th Knight of Kerry.O'Brien succeeded to the title Baron Moyarta in 1666. [SEP] Knowledge 2: Daniel O'Brien, 3rd Viscount Clare
Daniel O'Brien, 3rd Viscount Clare was an Irish nobleman, the son of Connor O'Brien, 2nd Viscount Clare and Honora O'Brien.Clare was appointed commander of a newly raised regiment of foot, Clare's Regiment of Foot, an Irish regiment in the Dutch States Army, on 8 August 1674.He was replaced within twelve months by Sir John Fenwick.From July 1751 this regiment was known as the 5th Regiment of Foot.During the War of the Two Kings, Clare served with the Jacobite Irish Army loyal to James II.He was the commander of Clare's Dragoons regiment which he led against William of Orange at the Battle of the Boyne and later exile in France as part of the Flight of the Wild Geese.He married Philadelphia Lennard, sister of the Earl of Sussex, and together they had three children:
Knowledge 1: Daniel O'Brien, 1st Viscount Clare
Daniel O'Brien,1st ViscountClare(1577?–1663) was an Irish politician and soldier.He was the younger son of Connor O'Brien, 3rd Earl of Thomond and Una O'Brien. [SEP] Knowledge 2: Daniel O'Brien, 3rd Viscount Clare
Daniel O'Brien, 3rd Viscount Clare was an Irish nobleman, the son of Connor O'Brien, 2nd Viscount Clare and Honora O'Brien.Clare was appointed commander of a newly raised regiment of foot, Clare's Regiment of Foot, an Irish regiment in the Dutch States Army, on 8 August 1674.He was replaced within twelve months by Sir John Fenwick.From July 1751 this regiment was known as the 5th Regiment of Foot.During the War of the Two Kings, Clare served with the Jacobite Irish Army loyal to James II.He was the commander of Clare's Dragoons regiment which he led against William of Orange at the Battle of the Boyne and later exile in France as part of the Flight of the Wild Geese.He married Philadelphia Lennard, sister of the Earl of Sussex, and together they had three children:

Answer: Connor O'Brien, 3rd Earl of Thomond