James McKeown/Grace Gallagher and Thomas Mckeown

I am looking for information on my ancestory and possible living, distant releatives who may still reside in County Cavan. Accourding to my Grandfather ( William Thomas McKeown III ) our ancestors came from Valley James Duff in Cavan County? I have tried to look up information on this but found nothing. If there is anyone who knows any McKeowns who have ties to my family I would love the opportunity to exchange email. Here is a sample of what I have found so far.

My Great Grand Father was William Thomas McKeown II, His father was William Thomas McKeown who was married to Grace O'Hara. His father and mother are Thomas McKeown and Grace Gallagher, these are the two that first made it to America. His father and mother are James McKeown and Charlotte Woods. James Had a twin brother. From what I know, James also worked in England and in harsh conditions. After James the trail goes cold. I hope to find any relatives who can help me in this quest. Sorry if it is confusing! thats whole lot of williams and thomas!