Former Alaska Gov. Sarah Palin’s oldest son was arrested Saturday night after he showed up at his parents’ house and started hitting his father in the head, after threatening to “beat his ass” in a fight over a truck, according to an affidavit from police in Wasilla, Alaska that was published by the Los Angeles Times.

According to the affidavit, Sarah Palin called the police, which led to the arrest of her son, Track Palin. Sarah Palin told police her son was “freaking out and was on some type of medication.”