I assume that Willian is Captain Sir William Wainright Lynar, and then the problem is after his marriage to Isabella Semple was there a son William Lynar, became rector of Islandmagee from 1849-70.
As you can see I'm working forward and trying to place Olivia Jane Lynar who married my grandfather on Christmas Day in 1899
My problem is the disparity of the dates, he died in 1870 and the marriage was in 1899. He may well have died when she was very young.
But if anyone can shed light on the Lynars around this time I will be very grateful