White Sox manager Ozzie Guillen's son Oney is firing back at Bobby Jenks after the former Chicago closer criticized his father.

Jenks, who signed a two-year deal with Boston last week, expressed disappointment to MLB.com that the White Sox decided not to re-sign him. He told the website he was "looking forward to playing for a manager who knows how to run a bullpen."

Oney Guillen called Jenks an ungrateful "punk" in a series of Twitter posts. In one, he writes that Jenks "cried in the managers office bc u have problems now u go and talk bad about the sox after they protected u for 7 years."

Oney Guillen resigned from his job in the scouting department in March after the organization took exception to some of his tweets. He previously posted critical comments of White Sox general manager Ken Williams.