Former Governor of Alaska Sarah Palin's brother has responded to Cher's foul-mouthed tweet aimed at his sister, calling her "vile" remarks "sad".

Chuck Heath, Jr. has penned an open letter to the pop diva on his page after taking offence to Cher calling his sister a "dumb C word" last week (ends15Nov13), and Palin is so impressed she is urging her one million Twitter followers to check it out.

He writes, "I was sorry to hear that you tweeted out such vile comments about my little sister. It’s sad because Sarah has never had a harsh word to say about you. In fact, our grandmother was one of your biggest fans. Have a good night, Chuck."

Palin adds, "I’m thankful they (brother and his wife) know how to react to irrational rants. Thanks brother! See you at Thanksgiving dinner! Bring your skates."

Cher launched an attack on Palin on Friday (15Nov13) by posting, "Go to the dictionary, & look up the ‘C’ word, … next 2 the definition … you’ll see a pic of Sarah Palin! No … wait … she’s under dumb C word."