Jack Reagan
John Edward Jack Reagan was the father of radio station manager Neil Moon Reagan and his younger brother President Ronald Reagan .
Jacks paternal grandfather, Michael ORegan, was a native of County Tipperary, Ireland. ORegan worked as a tenant farmer during his early years in Ireland, before he moved to London in 1852. ORegan married an Irish refugee, Catherine Mulcahey, in London and anglicised his family surname as Reagan. The Reagans relocated to Carroll County, Illinois in 1856, where their son, John Michael was born. John Michael became as a grainelevator farmer, and married Jenny Cusick in 1878. Cusick was born in Canada, but like John Michael, her parents came from Ireland. Their son, John Edward Jack, was born five years later.
Source: Wikipedia