Hiya,
Researching Irish ancestors is quite difficult. There are virtually no census records apart from 1901/1911 and other records are very scant.
Some links which may help:-
http://www.genealogylinks.net/uk/ireland/donegal.htmhttp://www.donegaltown.ie/forum/default.asp?CAT_ID=1http://freepages.genealogy.rootsweb.com/~irishancestors/Surnames/Dist.htmlhttp://freepages.genealogy.rootsweb.com/~donegal/http://www.dun-na-ngall.com/archives.html http://nzsghamilton.co.nz/ireland.htmRe passenger lists, have you checked records from Ireland only or did you include UK (England) lists in your research.
The Irish naming conventions would suggest that if Patrick was his
grandfathers name then he had brothers or sisters.
Irish Naming Conventions
The 1st son was usually named after the father's father
The 2nd son was usually named after the mother's father
The 3rd son was usually named after the father
The 4th son was usually named after the father's eldest brother
The 5th son was usually named after the mother's eldest brother
The 1st daughter was usually named after the mother's mother
The 2nd daughter was usually named after the father's mother
The 3rd daughter was usually named after the mother
The 4th daughter was usually named after the mother's eldest sister
The 5th daughter was usually named after the father's eldest sister
So, there may be one or more that stayed at home.
I think there is a link above which gives surname distribution - so that may be another avenue to explore.
All McFaddens will be related to each other somewhere along the chain.
Don't know if this helps but good luck with your research
regards,
Skippy