Sarah Palin's child rearing skills are now being questioned by the public after her daughters Bristol and Willow Palin used politically incorrect words to defend their mother's new show Sarah Palin's Alaska from criticisms on Facebook.

Willow wrote what many in the media described as "homophobic slurs" on the wall of a boy identified as Tre, a Facebook user who thought that "Sarah Palin's Alaska is falling so hard right now" during the show's premiere last Sunday in the US.

"Haha your so gay. I have no idea who you are, But what I've seen pictures of, your disgusting ... My sister had a kid and is still hot," wrote Willow Palin.

The younger Palin also used the word "f**got" to described Tre, who according to entertainment website TMZ, goes to the same school with Sarah Palin's daughters. The word used by Willow is perceived as demeaning and politically incorrect.

Her elder sister Bristol seconded Willow's comment with: "You're running your mouth just to talk sh*t."

At present, there is an on-going poll at TMZ asking its readers to grade Sarah Palin's child rearing skills. As of post time, the leading grade for Sarah Palin is an "F" with 56% of the total votes cast.

Bristol and Willow are the daughters of Sarah Palin, the Republican vice-presidential candidate in the 2008 US elections. The Palin family is featured in Sarah Palin's Alaska, an eight-episode series that is part travel show and part inside look at the family life of the controversial Tea Party favorite. The show was watched by 4.96 million people, most of them over 35 years-old, according to Nielsen data.