... 1911 name address from James CARSON. Another letter 1926 speaks of John Henry CARSON. Carson could be related but again not confirmed.
We also believe there is a stong likely case that Henry Watson also had more siblings we believe possibily a brother name David Watson and John Strain.
We do know Henry Watson had a nephew name David Watson. Sinton Watson? Not verified son to David Watson ...
Just posting the 1923 letter for the convenience of readers:
http://www.rootschat.com/links/01iez/Also to note these two possibilities. Firstly, there was a marriage of a James Carson and Mary Ann Watson in Lurgan Registry Office on 2 June
1845 [Edited to correct: 1849], the address for both parties was 'Corcreany', James was the son of Samuel Carson, a farmer, while Mary Ann's father was given as George Watson, a weaver. Secondly, there was a marriage in Shankill Parish Church on 29 November 1862 of a David Watson of 'Tiersogue' to an Eliza Jane Haddock of 'Corcrany', David's father was given as George Watson, a weaver, Eliza Jane's as George Haddock, also a weaver.
If this Watson family traditionally attended Shankill Parish Church, the only records I can see online so far are from 1845, anything before that (eg. Henry's baptism or his parent's marriage) would require a visit to PRONI (their holdings include baptisms from 1681-1872, marriages from 1676-1845, and burials from 1675-1857 & 1866-1877).