I have been doing some internet searches. I decided to look at the french revolution first. The first kind and queen to be beheaded during that time was King Louis XVI and Marie Antoinette. They only had two sons. One died as a child before the revolution and the other died of malnutrition after his parents were beheaded. I scanned the geneaology of Kings and Queens of France and all the dauphins (princes) had dates of deaths next to their names and no notations of being disowned. It was a quick scan though. It is a lot of information.