Your dad is an American citizin you live in Ireland does this make citizen?

A person's citizenship is determined by the laws of the country in which they are born or naturalized. In this case, the person is an American citizen because their father is an American citizen. However, living in Ireland does not automatically make the person a citizen of Ireland. To become an Irish citizen, the person would need to meet the requirements set out in Irish citizenship law, such as residing in Ireland for a certain period of time and passing a citizenship test.