In Magherafelt the McFall's, Mary Ann (McKendrick) & Thomas, had 13 children born between 1813 and 1832.
Archibald was born 15 Jan 1824 (although their was another Archibald McFall born in 1816 but he only lived 8 days).
Other McFall siblings were James, Margret, Martha Anne, Henry, Thomas, Charles Chambers, Robert Barkley, William, George, Mary Anne and David Chambers McFall. I'm pretty sure they were all baptised in the Magherafelt Presbyterian Church.