Thank you so much for this information. I have been researching this on behalf of Eileen Jamison born 1932 whose late husband was Bobby Cowan, son of William. She had 8 children although I do not know all of them. I found William's family after following up on his sister Florrie who witnessed William's marriage. I was also aware of Amelia but did not know where and if she married. Any additional information would be most welcome. I found another marriage in Fermanagh in 1850 between a James Cowan and Harriett Little and although I cannot be certain I suspect that this is james'father. His father was also James and I found a death of a James Cowan in his eighties in 1871 which I suspect is him.
Eileen lives in Newtownards and I live in Belfast. My email address is firstname.lastname@example.org
. I would be happy to share everything I have researched if you send me an email. I have copies of the relevant marriage certificates.