William Wainwright senior was buried at Carnew, Co. Wicklow (presumably the church nearest the Malton estate) - and Earl Fitzwilliam erected a large marble monument in his memory -- the text of it is over on the other thread
The tombstone you linked to in Dublin that mentions William Wainright Esq, his wife Mary and son Marcus are, I think, a little too late to be connected -- the deaths occurred in 1876 & 1883
If the soldiers are the sons of William Mara Wainwright & grandsons of William the Agent -- then as career soldiers they were probably both unmarried & childless on death -- but there is still brother John left at home in Carnew who could have had a family
