By Russell Myers & Mollie Quirk The Prince of Wales believes that his sister-in-law Meghan Markle and his brother Prince Harry “cannot be trusted”, it has been claimed by a source close to Prince William. Sources close to William have said that in the wake of King Charles’ cancer diagnosis, he would be the one to take on more duties himself if needed while it is understood he believes Harry and his wife Meghan “cannot be trusted”. This comes after a source close to Harry said “he would try” to help out if his father asked him to. Not only this, but Harry is alleged to have told friends he wou…