Just some further ideas that may help you along.
Irish civil registrations are mostly available online at
https://civilrecords.irishgenealogy.ie/churchrecords/civil-search.jsp
Since if James Charters married in Ireland in the 1840s it would be before civil registration of marriages and therefore not in this database but the death of his father might be.
There are four entries in the database for John Charters deaths in Cavan and one on Co. Monaghan that might be worth not ignoring.
If you search this database, it might be useful for you to remember that the following registration districts are relevant (Note: some districts span county borders).
Baillieborough, Bawnboy (pt of), Cavan, Cootehill (pt of), Enniskillen (pt of), Granard (pt of), Kells (pt of), Oldcastle (pt of).
If James Charters' father John Charters lived long enough for his death to be registered in the civil registrations for Co. Cavan, he might be in the database.
There were three entries in the database for John Charters deaths in Co. Cavan, all in the Cavan RD.
1. An entry for which no image is available online for John Charters 77 yrs old died in 1868.
2. John Charters, died 16 Nov 1877, married, 77 yrs old, labourer, address Bridge St., Cavan (i.e. town). Death registered by Anne Charters.
3. John Charters, died 17 Dec 1879, widower, 87 years old, residence Corlismore (townland). Registered by Patrick Charters.
There was also an entry in Cootehill RD for the death of a John Charters, widower, died 1 Sep 1876, residence Derrygooney. Jane Baggan informant. Derrygooney is a townland in Co. Monaghan on the border with Co. Cavan.
Although many records from the 19th century were destroyed in the fire in 1922, some remain. An important one is Griffith's Valuation. You can access it here
https://www.askaboutireland.ie/griffith-valuation/
If James' father was alive in the early 1860s and living in Cavan, he should be there. There are 5 hits for John Charters in Cavan. Four represent the same individual in Ballintemple civil parish. He leased two properties in Corlismore townland that were land only and two properties in Mullyamly townland that had a house, other buildings and 35 acres. So, he lived in Mullyamly. The other John was in Lisduff townland, leasing a 10 acre farm.
If James' father was alive when the Valuation survey was collected and he lived in Co. Cavan, he was likely one of these two. Of course, he could also have had a son John who took over his property.