Which son did Marie Antoinette sexually abuse?

This was a vicious excuse during Marie Antoinette's trial to have the jury (who were already scared to death their heads might role next) vote to have her executed (since evidence of treason for which she was tried was lacking!). This never actually happened.

The child in question, Louis Charles, was taken away from Marie Antoinette after Louis XVI was executed and he was put under the custody of a certain monsieur Antoine Simon who abused him and made him drink alcohol. He forced the child to sign a document stating his own mother had sexually abused him.

Even the jury was appalled by this during Marie Antoinette's trial because they knew exactly how this "evidence" had been gained. Therefore it was thrust aside and never used as official evidence in the case.