I suspect that Archibald was somewhat (maybe considerably) older than Agnes. I have the birth date of one of his brothers in the 1830s. Archibald died on 10th April 1898 and we know from his will (proved on 27th September 1901) that he left everything to his wife. The schedules attached to the 1901 Census show us that Agnes not only owned the land on which their house, number 28 Maxwellswalls, stood, but also that on which 29 stood. Clearly from the time of Archibald's death three years earlier Agnes had continued to farm, no doubt with a little help from her retired father. This would have meant a continuing stable family life for all the children who were still in education. William, the eldest is called 'Farmer's son' so clearly was employed on the farm. We have a very different picture ten years later from the 1911 Census, possibly a change which came about when her father died, when the family moved into the Shankill area of Belfast. They were still all together, all still single and living at 3 Diamond Street.
William, the eldest, now 25, was a General Labourer, as was his brothers Robert, 23, and John, 17. Jennie, 21, was a Linen Weaver, as was her sister Margaret, 19. Nathaniel aged 15 was a Message Boy. There is now no occupation against Agnes' name, who is 45 and still 'Head of Household'. With six incomes coming in she could no doubt afford simply to continue to be the home keeper, though doubtless she had her own income from the sale of the farm in Maxwellswalls. After this time I do not know what happened to William. Jeannie married later in 1911 (23rd June) to Thomas Smyth. Her sister Margaret was her marriage witness, though I don't know what happened subsequently to 'Maggie', nor indeed to Robert (Bob). John married Elizabeth Kerr. They had three children, William Wallace, Elizabeth and John. After John senior's death in December 1946 consideration was clearly given to emigration and it would seem that almost the whole family went to Queensland, Australia in the mid '50s, though John turns up later in New Zealand where his descendants flourish today. Other descendants are in Australia though one, an eminent scientist, has moved back to the United Kingdom. Archibald and Agnes' youngest son, Nathaniel, married Charlotte and had two sons who I think stayed in Northern Ireland.
Finally, there is a Memorial Inscription in Connor New Cemetery, as follows:
In loving memory of Nathaniel McIlhagga
beloved husband of Charlotte McIlhagga,
died 22nd March 1937
aged 41 years.