The saying "shirtsleeves to shirtsleeves in three generations" remains as true today as it was a century ago. Kids, taxes, bad investing and the debauching effects of wealth over the generations have not changed.

An observant wealth expert sent us a data analysis combining the new Forbes richest family list and the Forbes billionaire's lists to figure out how many of today's billionaires are first generation, second, third and so on. The results prove the "shirtsleeves" adage—that family wealth seems to hit a cliff at the third generation.