According to the Small Business Administration, more than 70 percent of all family businesses do not survive through the second generation, and 8 percent do not make it to a third.
My own experience in the third world was that even if people started to make more money, the cost of living and housing increased often faster than the wages.
If people ask me for the ingredients of success, I say one is talent, two is stubbornness or determination, and third is sheer luck. You have to have two out of the three. Any two will probably do.