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I would bet he is half Romanian without a doubt. There are even Irish people with grandparents and great grandparents that are from places like Cyprus, Italy, Greece etc. There has always been some immigration to Ireland even if it was lower numbers and someone in their 30s with an non-Irish parent would not be unusual at all. That man definitely was not fully Irish.
There was even men like Paul McGrath who had a Nigerian father and he was born in 1959 and there are plenty of Irish people from the past who have some foreign ancestry like Linda Martin who was born in 1952 and her paternal great-grandfather Francis Martini was born in Dublin to immigrants from Saronno, north of Milan, Italy. There's most probably plenty of Irish with some foreign ancestry. Your logic is faulty.
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