It's not contradictory for a majority of wealthy people to be wealthy because of their parents, and for 70% of wealth to be lost by the 2nd generation, even if

It's not contradictory for a majority of wealthy people to be wealthy because of their parents, and for 70% of wealth to be lost by the 2nd generation, even if both sets of stats were accurate and comparable. What is contradictory is your assertion that the 1st generation wealth, and the remaining 30% at the 2nd generation, translates to "almost none".