The difference is, in these cases the business hierarchy usually follows the family hierarchy. In other words, parents hire kids. This is an established paradigm. Sometimes siblings hire each other as well, and that can be OK more often than not.
But, that's not to say kids should hire parents. In that case, the business dynamic and family dynamic are very different. From a historical/statistical perspective this is an extremely unorthodox arrangement, for a good reason imho.
