Bernadotte family paid once the Swedish government's public debt with their own private assets after Jean Baptist appointed as Crown Prince against the government subsequently repaid the interest ence of maintenance to the royal family Bernadotte. The royal appanage originated from here. Bernadotte family was not without money, and money has been well managed over the years. This money is not the Swedish state's assets, but belongs by right of inheritance Bernadotte family.
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One can naturally ask whether it is good that a young man in the prince's age is maintained by his Father. (But it 'is another discussion). I have acquaintances that will help their own children the same age as I myself tried to teach my children to become independent. However, I can not comment on what my friends do with their own money than we may have views on what the Bernadotte family does with their private funds.