Mercer’s stepsister told the station he was born in England and traveled to the United States as a young boy. She said Mercer’s father, who lives in Tarzana, married her mom and that the last time she spoke with Mercer was a year ago.
http://www.cbsnews.com/news/umpqua-community-college-shooting-chris-harper-mercer/
Good find. That would explain why he was into IRA politics