The children's births which tie in ages with those census records (can't find Mary Ann's birth but if her given age is correct per census she would have likely been a twin to Henry or born within the year)
Henry b 12 March 1865
Rachael b 24 June 1867
George b 12 September 1869
Joseph b 22 July 1872
Yes found her Mary Ann Gillespie b 1865 Armagh - Civil Indexes