My name is Carolyn, and I am a granddaughter of Michael Anthony Connell. It sounds like you have the same people as I do but there are some diffeneces. I will tell you about mine.
William O Connell and Margaret Coffee (Coffee) O Connell, I believe were raised and married in Ireland, coming to the U S and settling in Pittsburgh, PA before 1855 as their oldest son, William was born in PA in 1855.
Accordint the 1860 census (which they were'Connel' they were in the 6th Word of Pittsburgh. They just had fist initials and there were W (father) M (Mother) W (son-age 5) M (daughter age 1) and C (daughter age 5/12) In the 1870 census their last name was O Connell and Robert (age 8) and Michael (age 5) had been added, but no mention of the two girls. They were in the 21sth Ward then. In the 1880 census only William the father and Michael was in it. They were in the 3rd Precent, 21th Ward.
In a book that Michael Connell's had it said that
William A Connell (son) died March 20, 1877
Margaret Connell(mother) died Feb 21, 1878
Robert B Connell (son) died May 02, 1880
William O Connell (father) died Feb 05, 1884
They are all buried in a St Mary's cemetery in Pittsburgh at 45th St and Penn Ave. They are buried in Section N, Lot 257 along with several other people. Edward O'Connell is the main person on the tombstone. (He was from co Tipperary in Ireland.) I hope this helps.