Seeking help on father's identity

Dear sir - I have recently started my family tree for myself and children and grandchildren. So far I have failed to who my father is or was. I would be grateful if anybody could help me. People in the Kilmessan, Robinstown or Dunderry areas of County Meath might remember myself and my brother. I was born in May 1949; my brother September 1950. We lived in Ennistown, Kilmessan until 1952 when we were both placed in institutions. My Mothers name was Mary (May) Walsh. She had two brothers, Michael (Micky) and Sean. My grandparents were James and Mary Walsh. My mother later married (in 1954). She worked for WM Darcy of Robinstown at that time. I would appreciate any help on this matter, which will be kept in confidence. Yours, Patrick Walsh, 26 Tymonville Grove, Tallaght, Dublin 24.