Levi Johnston and Sarah Palin Levi Johnston and Sarah Palin

Sarah Palin says she is "appalled" at Levi Johnston's claim that she called her son, Trig, "retarded" and takes the father of her grandson to task for posing for Playgirl.

"We have purposefully ignored the mean spirited, malicious and untrue attacks on our family," Palin says in a statement, according to People. "We, like many, are appalled at the inflammatory statements being made or implied. Trig is our 'blessed little angel' who knows it and is lovingly called that every day of his life." (Trig, 1, has Down's Syndrome.)

Levi Johnston to post nude for Playgirl

Johnston made the remark on Wednesday's The Early Show

, on which he also claimed to know secrets about the former Republican vice presidential nominee that "could hurt her." "I'm not going to go that far," Johnston said. "You know, I mean, if I really wanted to hurt her, I could very easily. But there's — I'm not going do it."

Sarah Palin to sit down with Oprah

Johnston's "lies" are part of his ploy to drum up attention, Palin said, noting the 19-year-old's decision to pose fully nude for Playgirl."Consider the source of the most recent attention-getting lies," she said. "Those who would sell their body for money reflect a desperate need for attention and are likely to say and do anything for even more attention."