Their son Henry Benson Critchley had a son John Benson Critchley (m. Mary KEARNAN), who were my great-grandparents.
Their daughter Eulalie May married my grandfather Maurice Raymond MANGAN
They had a son Raymond Desmond MANGAN (m. Clare DOWD) who had me Jennifer Clare Mangan (m. Grant MITTON).
I have a bit of info about this side of the family, if you're interested.
I also have info about Michael & Margaret, but I don't have them as brothers - their daughter Esther married Arthur O'Neill. His parents were Arthur O'Neill & Anastasia (nee Critchley), who's parents are John & Ellen.
I would suggest these Critchley's are related back a generation or two, maybe second cousins etc