I am Rob Dickinson. My Grandfather was Walter Hadden of Dunmacmay. He was one of six sibling, the other 5 being Fanny, John, William, Hans and Alfred. There father was William. They lived on a farm bordering on the Blackwater River, which separates County Tyrone from County Monaghan. I  was lucky enough to visit the farm in 2011. It has been unoccupied since 1952 bit it must have been quite the place in it's day. After William and his wife died, the farm came into my grandfathers name. In 1927 he emigrated to Canada where he lived the rest of his life. I have much information on the Haddens on my family tree and if you would like to review it, email me at  robdickinson@rogers.com and I will be happy to invite you to view it.
[Edit] Link to Rob's tree (see James HADDEN of Dunmacmay below).