Thanks for the response!
I've gone back and checked but I can't find any record of a Martha Doak marrying before she married my gt grandfather. The only other Martha Doak listed married a Joseph Rudduck in 1861. My Martha was born in 1866.
I found the record for Martha Maxwell marrying Samuel Doak on 27 Jan 1870 at Newmills Presbyterian Church in Tullylish and have found 2 children - Sarah Jane b 12 Nov 1870 and James Alexander b 26 Oct 1872.
Not sure who Abraham and Samuel are! Abraham was born in Lurgan 1894. Don't think Samuel is Samuel Edmund as Samuel E was born Jan-Mar 1881 which would make him 20 by the time the census was taken on 31st March. There is another Samuel Doak born in the same area between June and Sep of the same yaer. Ive ordered certificates for both - will let you know what I find out