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I think you will find Robert Pritchard and his wife Emily (nee Magill) living with their daughter Maggie McMillan on the 1901 census in William Street, Newtownards. They both died in 1906 about 6 months apart. Also living with them was a Emily Pritchard, a daughter of Thomas Henry Pritchard and Margaret McCullough. Thomas Henry was most likely another son of Robert and Emily. On the 1901 census Thomas Henry was living only a few doors away on Lanark St, from James another son of Robert and Emily. James had a son Victor and also one called Joshua, most likely called after aunt Maggie's husband Joshua McMillan.
Unfortunately, it looks like Maggie and Thomas Henry were born before 1864, before official birth records, begun to be kept, so some of the above, is guesswork.
Yours
SIMW

William McCay and Martha Quigley, had 7 children (according to the 1911 census), including a daughter called Margaret in 1884. It looks possible  that the Margaret McCay who married Thomas Robert Fulton,  was William's and Martha's daughter and sister to LT Thomas Fulton McCay.

Rachel's mother was Margaret Walker and  I think Rachel was one of  7 children.
I don't have much information on the descendants of Adam's first marriage to  Jane Dale.
What's your interest in Adam and Rachel?  I have I little more information on Rachel ancestors.

I've come across this Edward Wasson/Catherine Haslett marriage before. Her father was Robert, his Alexander. Both Edward and Catherine were from the townland of Ballycraigy/Ballycreggy.
This townland is on the very edge of Ballymena in the direction of Kells.
The Hazlett/Haslett/Hezlet family had been in the area a long time before the marriage of Edward and Catherine. In Ballyclug Graveyard, located in the same area, there is a Hazlett headstone and one of the inscriptions on it dates back to 1720.
If you want to see the full inscription, go to Ballymena's Braid Centre's website, www.thebraid.com/genealogy.aspx . Ballymena Museum is making the headstone inscriptions from all the graveyards in the Ballymena area, available on-line.
Also on this site you'll find Jesse and Margaret O'Hara headstone in Connor New Cemetery (including his father's full name George Boal O'Hara) and I believe Edward and Catherine Wasson's headstone is found in St Patrick Churchyard Ballymarlagh.
There is Edward and Catherine Wasson on the 1911 census living in the Ross townland close to an Alexander and Agnes Wasson (most likely Edward's son and daughter-in-law). The ages on the headstone and census match roughly the information you already have on Edward and Catherine's children.
While Jesse and Margaret O'Hara are living in Tully in 1911
I also found the marriage of a William O'Hara of Tully to Jane McKillen of Liminary in 1869. William's father was  George B O'Hara. William could be a brother of Jessie's. By coincidence, one of the witness to this wedding was Martha MccAllen. I think one of Jesse and Margaret's children was called Margaret Anne McAllen O'Hara.
I hope you find some of this information of some use.

I think, it's in Dunaghy Old graveyard.