John Rynne Irish/American

Searching for a John Rynne(not sure of spelling of Rynne as there are different spellings) who was Irish/American who would have been born approx 1920-1930-there are many John Rynnes but this one had 2 sisters who were nurses in Manchester(UK or USA?)in 1951-if I found out the names of these sisters I could pinpoint the exact John Rynne-perhaps they moved back to Ireland or emigrated to USA? This John Rynne would have had to be in England/Wales in 1951-he is my father-I am 61 and long to know who he was before it is too late or where he came from so I can visit and perhaps meet some of his relatives-my mother died many years ago of breast cancer and that is all she told me.I carry this longing and sadness every day to find my father.My mother was called Winnie Williams and worked in a NAAFI I think in Caerwent south wales-she lived in forest of dean,Gloucestershire when I was born- thankyou for any help Pauline