When I see Knocknamuckley baptisms of Jones, I am often seeing 2 Jones families listed together. William John b 1863 to James and Caroline is baptized at the same time as Eliza to Thomas and Eliza. You may have very close families so I should list more.
Arthur Jones 60 with wife Eliza 56, children Elizabeth 23, Robert 20,Mary 16, John 15, James 11, Wilson 8, and Teresa Wallace, the illeg. child of Elizabeth. John m. Margaret Gardner in 1869 and says he is 23, so this family does not track birth years closely. Mary marries John Best in 1871 from one of my distant relatives. There are also some scattered Jones like Maria, but living in other households.
Also, a Meredith Jones is witness to a marriage in 1859. There is also a Meredith of Ballyhannon whose will went into probate 1814. He might be listed at PRONI in tax records, but I can't check right now.
Many Canadian marriage records and death records lists parents. Have you looked at these?