The first group were photographed at the family reunion in 1976: from the left we have three sisters: Anne and Tess Hannagan, Rose (Gallagher) and their cousin Mona. (I have three Mona Hannagans listed on the family tree, so I'm not quite sure which one this is, though my bet is on Mona Thomas.)
The next picture comes from four years later: the three sisters have not aged well, although it must be admitted they weren't young ladies either (Anne was 84, Tess, 81 and Rose, 88). Rose is in the middle, and died a year later.
In this photo we have cousins of a different generation. I think it's Denise Hannagan on the left, with Kathleen Ryan behind her; Anne (?) Ryan in the front, and Mary Stokes at the right.
By way of contrast, to the left we have a group of boy cousins: Paul Stokes, myself, John Ryan and Raymond Hannagan.
On the right is Terry Hannagan on his wedding day, with Monica (nee McCabe), his new wife, and Jack (his younger brother) and Phil (Monica's sister).
The photo below is of Des and Monica at their wedding - the quality isn't so good because this is already a copy of an original.
And the photo above was taken at Brian O'Flaherty's wedding to Jean. Brian's parents, Des and Joyce O'Flaherty (nee Hannagan) at to the left, with Terry, their other son beside them. On the other side of the couple is Pat O'Flaherty, and presumably Jean's parents.
Finally we have a photo of Jack Hannagan as a boy - I have no idea who the Bishop is, or the other two boys. [Wikipedia tells us that James Whyte was Bishop of Dunedin from 1920 to 1957, but there was also a coadjutor Bishop, Hugh O'Neill, from 1943-1946. My guess is that it's more likely Whyte.]