Devenport Brothers

[Kiltaglassan]

Margaret may have had a brother David who married Margaret Ferguson also in Clonlum area.
(Two Donnelly witnesses on marriage cert.)
 

Here's that marriage - 3 November 1875 at Jonesborough Parish Church. Father of the groom, Hamilton Devonport.
https://www.irishgenealogy.ie/files/civil/marriage_returns/marriages_1875/11218/8112273.pdf

Added: Clonlum townland about 5-6 km NW of Jonesborough
https://www.openstreetmap.org/relation/5214646#map=13/54.10974/-6.37207

[Siely]

Thanks kiltaglassan

Is it "Church of Lowsford"  and rector of Lowsford at bottom of David & Margaret marriage cert.

[aghadowey]

Is it "Church of Lowsford"  and rector of Lowsford at bottom of David & Margaret marriage cert.

It's "Church of Jonesboro" [a variation of Jonesborough] and 'rector' doesn't appear on the marriage registration.

[Siely]

At bottom of whole page it says
........R. Scott
Rector of Jonsboro
 

[aghadowey]

At bottom of whole page it says
........R. Scott
Rector of Jonsboro

Ah, bottom of page not bottom of their marriage entry- It's a poorly written Jonesboro and yes, rector. I think his name is James R. Scott not R. Scott.

[Kiltaglassan]

I think his name is James R. Scott not R. Scott.

Agree with Aghadowey 

Image below.

[Siely]

I wonder if the Canon Law of the Church of Ireland or Roman Catholic Church would prevent a second marriage (and hence child birth registrations) of the anonymous father of both Robert and James.

[aghadowey]

I wonder if the Canon Law of the Church of Ireland or Roman Catholic Church would prevent a second marriage (and hence child birth registrations) of the anonymous father of both Robert and James.

Sorry but I'm not sure exactly what you are saying. The birth registrations (which have nothing to do with the church) for Robert and James do not list their father/fathers because the parents were not married. This doesn't mean the father/fathers was/were not in their lives at least for a little while.