The marriage of Robert Blair and Elizabeth/Eliza Hughes easily found but his father is
Richard Blair, dead (not Robert) which means he's unlikely to be Ellen's brother/half brother. Robert is a widower living at, I think, Bovain.
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1863/09650/5499792.pdfSo, looking for Robert's 1st marriage (in case father's name is incorrect) I found this one-
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1849/09369/5393038.pdfRobert Blair, age 22 (so born c1827), married Ellenor Rice, daughter of Charles Rice. His father again listed as Richard Blair.
Remember that one of Ellen Farrell's older daughters called Norah (a form of Eleanor as is Ellen) and she had a son called Charles.
This is how I
think the family tree goes-
Richard Blair (d.before 1863)
1. Robert Blair (c1827) m.(1849) Ellenor Rice (d.by 1863), m.(1863) Elizabeth Hughes
1. Ellen Blair (born before 1863? of daughter of Ellenor Rice)
2. William Blair, witness to Ellen's 1886 marriage-possibly her brother/half brother
Now, back to Robert Blair's 2nd marriage to Elizabeth Hughes. There weren't a lot of Robert Blairs in Dungannon registration district (only 3 deaths) and I found this one early on-
Robert Blair died just before 1901 census- 7 Jan.1901 Ballynakilly, age 65, married, informant was a daughter Mary A.
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1901/05740/4620581.pdfThere's a widow Eliza Blair in Ballynakilly in 1901 and 1911-
http://census.nationalarchives.ie/pages/1901/Tyrone/Drumaspil/Ballynakilly/1736002/http://census.nationalarchives.ie/pages/1911/Tyrone/Drumaspil/Ballynakilly/864992/ (says she an old age pension so would be worth looking for pension extract.
Possibly her death?
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1918/05175/4428151.pdfGoing back to Robert Blair's death- informant was daughter Mary A. Mc_ (hard to read) but here's her married in 1877- note bride's residence was
Derry.
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1877/11140/8079720.pdfmore to follow...