Hi. Did you happen to find more info about your Patrick Brennan and wife Mary? I'm looking for the parents of my great-great-great grandmother, whose father was named Patrick Brennan (from Ireland) and was married to a Mary (don't know her surname). We think Patrick died around 1854 and Mary in 1848.
The Patrick and Mary in my tree had a daughter named Mary Theresa (b. 1830 -- which wouldn't match the marriage date between your Patrick and Mary) who married George Gowen.