I figure I am about 1/3 Irish. My father is 1/2 Irish and 1/2 German. My mom is part English, part Irish, and part Welsh. On my mom's side we've traced the tree back 800 years with extensive research. (without Ancestry.com...this was done in the 90s) The last person on the tree has no last name - so that was the end.
Btw, I believe the Breastplate of St. Patrick makes for a good morning prayer. A healthy devotion to St. Patrick would be a nice gift right now for the suffering Church in Ireland. Just a thought.
Happy St. Patrick's Day.