That is a fact. Camilla Younger married Eustace Parker Bowles and became Camilla Parker Bowles and she was in fact sister-in-law of the HRH Duchess of Cornwall. 
    

 ==False submissions by the various "contributors" regarding family members== 

 The Earl of Halifax did not have any other children, other than The Hon James Charles Wood, Lord Irwin (The Heir Apparent) and Lady Joanna Victoria Wood fiancé of Jack Morton. Lord Halifax did not have any other marriages but the one with Camilla Wood (née Younger), The Countess of Halifax, formerly known as Camilla Parker Bowles from her previous marriage to Eustace Parker Bowles. 

 There was numerous attempts to submit false information to this article and suggest that The Earl was married to other women and had other children from other marriage which is clearly false and is not recognised by the Wood family. Such information was not found in any official records. 

 It was reported that The Heir Apparent, Lord Irwin, had to begin legal discussions with his solicitor regarding illegitimate claims from Mr. Paul A. Needham and other false contributors, claiming to be members of the Wood family, legal action was stopped in May 2015 due to parties agreement to stop any future "claims". However attempts from other false contributors continuing on daily basis from mostly mobile devices as well as desktop computers. I would suggest admins block such IP addresses to prevent future attempts to submit false information which is being "picked up" by other websites as they rely on accuracy of the Wikipedia articles. 
 The article reference to peerage.com website must not be taken into consideration in this article because the source of the article on the website cited as wikipediahttp://www.thepeerage.com/s1.htm#s130, "[S130] Wikipedia. Online http;//www.wikipedia.org".