The List of Freemen of the Corporation of Fethard lists a George Bowles of Coolquill in 1771.  Coolquill is just about 2 miles East of Killenaule and the Church of Ireland cemetery in Killenaule has a memorial stone reading "Here Lyeth the Body of George Bowles who Dep. this life Feb. the 9th of 1777 Aged 42 Years".  There are no further references to George after that so I'm tentatively assuming they are the same person.  Another stone in the Killenaule Cemetery is a memorial to Susana Graham nee Bowles who died in 1792 at age 36.  There is also a marriage record in the Fethard church register for an Ann Bowles of Killenaule to George Ryall of Fethard on Jan. 12, 1777 and a memorial stone at the Crohane Cemetery about 1 mile from Coolquill for John Bowles who died in 1840 at age 78. 

These are the first references that we have for the Bowles in the Killenaule area and are grouped very nicely to be one family.  We can suppose that George (b. ~ 1735) was the father of Susana (b. ~ 1756), Ann (b. ~ 1757) and John (b. ~ 1762).  As likely as it is, we may never be able to prove it as very few records have survived from that period. 

When George was admitted to Freeman Status in the Corporation of Fethard in 1771, John Bowles of Fethard was admitted the same year.  John Bowles of Fethard was born in about 1744 which would make him a likely candidate for George's brother.  There were two Bowles, Charles and David, who were admitted to Freemen status in Fethard in 1755.  Possibly one of them was George and John's father.  See The Bowles of Fethard for more on the events of those times as they may have affected the Bowles.

This is only a possibly theory to be proven or disproven yet but the truth may come from an examination of the record books for the Corporations of Fethard and of Killenaule.

Some misc. records: