And you ended up in California.. wise!.. I'm from the land of ice and snow... but been lucky so far this year.
Found this data only item on Ancestry, mother's name is a match, birthdate off by 3 days... father's name is different than what's on your tree.
There are a number of children that can be found on FamilySearch too...
What a big family!
Ireland, Births and Baptisms, 1620-1911 about John Duggan
Name: John Duggan
Birth Date: 14 Feb 1866
Birth Place: Bridgetown, Clare, Ireland
Father's Name: Michael Duggan
Mother's Name: Ann Littlton
FHL Film Number: 101124
Ancestry.com. Ireland, Births and Baptisms, 1620-1911 [database on-line]. Provo, UT: Ancestry.com Operations, Inc., 2011.
Original data: Ireland Births and Baptisms, 1620–1911. Index. Salt Lake City, Utah: Family Search.
You asked about the Declaration of Intention - will contact you about that.http://www.genealogybranches.com/naturalization.html
Sorry to hear about your health! I wish you well.
Check your mail.