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Boyle is a very common surname in Templecrone parish.
RC church records for the area start late (1876). I also searched for a civil birth record for Catherine and James but did not locate a record so possibly their births were not registered civilly.
The 1857 Griffiths Valuation head of household listing for Templecrone civil parish shows about twenty Hugh Boyle records http://www.failteromhat.com/griffiths/donegal/templecrone.htm Possibly he was the Hugh in Meenabologan townland.
You may want to post the story of James Boyle and his family on our XO Chronicles site https://www.irelandxo.com/ireland-xo/history-and-genealogy/ancestor-data...
Have you considered autosomal DNA testing?