Tell me again, where Denis' parents' names come from, what document?Did Aloysius die young?
I don't think you can scrutinize dates that closely, use them as guidelines.
Your best bet is to list "exactly" who was born in IRE in those DC households that you _know_ are your Connells, and let the paper trail lead the way.Any siblings listed in Denis's obit?Are any buried with him in DC?(Sorry, if we've already covered this ... :)
And, yes, it looks to be a collection from different marriages.Those townlands are spread out.Go to google.com, click on "maps" and search Laharn Cork Ireland --- zoom "out" and you can see most of those small townlands.(I.e., Eyeries is my own research area, no where near Laharan, out on the Beara penninsula, probably not yours.)
Looking at familysearch.org -- w/only the parents' names, you'll see those are multiple Connell/sullivan marriages, with 30-40 yrs between births:
Name: Dennis Connal Age in 1860: 24 Birth Year: abt 1836 Birthplace: Ireland Home in 1860: Washington Ward 4, Washington, District of Columbia Gender: Male Value of real estate: View image Household Members: Name Age Richard R Burr 66 Mary Burr 58 Mary A Burr 37 Sarah E Burr 27 Rebecca Burr 21 Harrison Burr 19 Henry Burr 16 David Dealan 30 Hannorah Dealan 28 John Lahey 12 Thomas Barrett 40 **********Dennis Connal 24 Engineer Patrick Mccarty 23 James Hines 42
1870: Name: Dennis Oconnell Age in 1870: 33 Birth Year: abt 1837 Birthplace: Ireland Home in 1870: Washington Ward 4, Washington, District of Columbia Race: White Gender: Male Post Office: Washington Value of real estate: View image Household Members: Name Age Dennis Oconnell 33 Catherine Oconnell 26 Aloysius Oconnell 9 Annie Oconnell 5 John Oconnell 1 John Cahill 24 Emanuel Thomas 31 Jane Bannigan 45 Nancy Adams 15 Mary Donohue 11
1880: : Dennis Connell Age: 43 Birth Year: abt 1837 Birthplace: Ireland Home in 1880: Washington, Washington, District of Columbia, District of Columbia Race: White Gender: Male Relation to Head of House: Self (Head) Marital Status: Married Spouse's Name: Kate Connell Father's Birthplace: Ireland Mother's Birthplace: Ireland Neighbors: View others on page Occupation: Grocer Household Members: Name Age Dennis Connell 43 Kate Connell 32 Aloywisus Connell 18 Anna Connell 14 John Connell 9 Frank Connell 7 Lawrence Connell 5 Mary Connell 4 Kattie Connell 1 Harry Raedy 18 Jane Bannagin 50 Mary Donohue 18 Mary Ohare 15