Kailyn Lowry Fights to Change Her Custody Agreement: Preview of Teen Mom 2 Season 3, Episode 4 (VIDEO)

After Kailyn discovers that her baby daddy, Jo Rivera, has been drinking while taking care of Isaac, she files to get custody of her son every other weekend. Will she succeed? Tune in next week on Monday, Dec. 3 at 10 p.m. ET on MTV to find out!