And here’s a relevant bit from the Dobbs report:
Several witnesses swore to Christian Stewart, the mother of testator, being the daughter of Archibald Stewart, of Ballantoy, by his wife Martha Dobbin; but besides contrary parole testimony, an old family bible in the possession of Dean Dobbs, of Carrickfergus, was given in evidence, in which the names of the children of Archibald were put down; and not one of them, except the name of Mary, answered to the names of the brothers and sisters of Christian, and that Mary was married to Richard Dobbs: Whereas Mary, the sister of Christian, was married to Mecum McConoghy. Besides this, there was clear evidence that the wife of that Archibald was a Ward of the county of Down; and Mrs. Shaw, a most respectable old lady of 95 years of age, and perfectly clear in understanding, swore that Jane McCullogh was one of the Testator’s grandmothers; and beyond all doubt, Mary Ann Boyd was the other. This Mrs. Shaw was well acquainted with the family, and Mrs. Ann McAlister another old witness, who had lived in the family for many years, also proved that Ninion Stewart was the father of Christian. I am this particular as to shewing that Archibald was not her father; and that Martha Dobbin was not her mother; because some thousands of claimants came forward, as allied to said Martha Dobbin, the alleged wife of Archibald Stewart, and th alleged mother of Christian, the mother of Testator.