(CNN) - Levi Johnston, the father of Sarah Palin's grandchild Tripp and fiance of daughter Bristol, quit his job earlier this week after reports that his lack of a high school diploma made him ineligible for the apprentice position he'd held since fall.
Johnston's father Keith told the Anchorage Daily News that his son felt the move was "the best thing to do to kind of calm the waters, so to speak," and that his son's missing educational qualification was "just something that slipped through the cracks."
"You guys are watching him so tightly," Johnston told the paper. "He's being treated different than an average 18-year-old kid. He has to do everything by the book now."
Palin herself called the report a "a political potshot taken at me," that could "destroy a young man's opportunity for work."