Susan, From my family tree:-
John Collins married Mary Witherow who was born in 1801 in Dungiven, Co. Londonderry
They had 5 children
John Collins m Sara Moreland and died in Ballymena
Stuart Collins m(1) Martha Crossit m(2) Mary Anne Clark
James Collins m 1852 Sarah Ann McClorg b 1836 (your great grandparents)
Jane Collins b 1836 m 1861 Henry brown b1830
Mary Collins b1838 d1918 m1868 William McClorg b1832 d1920 (my great grandparents)
John and Sara had 4 children Stuart, William, Hubert & Sadie
Stuart and Martha had 3 children I know of Martha, Stewart, John and according to aghadowey 2 more Essie and Richard
James and Sarah Ann had 3 children; John who went to NZ, Alexander James & Elizabeth who married William Bradley
Jane and Henry Brown had 6 children; Tom, John, Joseph, Martha, Harry,Sam most seem to have gone to Toronto, Canada
Mary and William McClorg had 5 children; Alexander (My grandfather), Anna, John
David (from who I got much of my information), Martha (who married John Smythe and went to New Zealand where their son, Arch, died in 2004)
The 1901 Census has Sara Anne Collins (no mention of James, her husband). living in the household of Blanche May Collins. Blanche was the wife of Alexander James Collins (your grandfather's brother) The 1911 census has Alexander at home (he was a commercial traveller in woolens) but there is no mention of Sara Ann who had, presumably, died.
1901 census has John Collins in Longfield married to Agnes.This John Collins would be the son of Stewart Collins and Martha Crossit
1901 and 1911 Census have Henry Brown and household in Ballygowan
McClorg was the spelling of my family name up until my grandfater , Alexander) and his siblings changed it to MacLurg because they thought it was the original spelling of the name when the family came from Scotland back in 1600s