Hi
I did find a Michael Coyle and a Michael Callery on the Griffith’s Valuation, in Cavan. I have also found a sibling for both Rose and Edward, and I think it would indicate that at least one of the parents would have been older than first thought.
1. Ann Callary
1828 – 1873 and she married
Peter Mullen
1804 – 1877
2. Philip Callary
1846 – 1925 and he is on the 1871 census, with Edward and Rose and listed as brother in law to head of household. Ann Callary's son Peter Mullen is on the same census, listed as a nephew, age of 19. We can then assume, possibly, that Ann and Peter were married over 20 years before. And the 1861 census for Peter and Ann lists the following children: James 14, Peter 8, Michael 7, Thomas 4, Patrick 2, and two cousins Thomas Mullen and Patrick Hart, both age 20. Both born in Ireland. As their first son was born in 1847, they married around 1846 in Ireland. As Ann was born about 1828, Michael Callary, her father, could not have been born in 1820.
Peter's death cert gives his parents names and his age of 73, in 1877. The 1861 census has Ann, Peter and son James as all being born in Ireland, so we may assume that they married in Ireland, and moved to Scotland between 1847 and 1853, as Peter Jr. was born in Scotland.
A check could be made to look for Ann, Rose, and Patrick Callary and their parents Michael Callary and Mary Naulty in Boyle, Roscommon, Ireland or Crosserlough, Cavan, Ireland. Maybe for the Coyle family as well.
I have attached the death certs for Edward and Rose, that give their parents names.