Sarah Clegg lived on Copeland Island. Her father, Henry Clegg is listed in Griffiths Valuation. He had plot 4 which was 50 acres. The buildings are still there based on Google Earth.
A death for Henry Clegg on Copeland is listed in 1884 at 88 years. The will of Henry Clegg late of Copeland Island, County Down, Farmer, died 7 July 1884 at same place was proved at Belfast by James Wallace of Donaghadee in said County Draper one of the Executors. His wife, listed on the PRONI site as Jane, 2 sons Richard & David who were to inherit the farm, son Henry in Australia, daughter Sarah McNeill and daughter Mary Ann Robinson.
William McNeill, Sarah's husband was a teacher on Copeland Island per their marriage register. His father is listed as John McNeill, farmer.