lost family in Ireland (Dublin)

Hello, I'm trying to get in touch with my father Alberto Hernandes. He was a sailor and his parents moved to Ireland, not sure which part. I'm 53 years old. My name is Anabela. My brother's name is Jorge. My mother's name is Lucinda. I was born in Portugal and moved to Mozambique and then to South Africa. My mother never allowed him to get in touch with us. I want to know about him even if he is deceased. It would mean a lot to me.