I can't think of any mechanism by which wealth owned by the rich (i.e. old) can skip a generation.
The only way this proves to be false is if we eventually discover the secret to healthful immortality and end up with a generation that never dies, and therefore never bequeaths its wealth to younger generations. The longer people live, the longer it will take younger generations to inherit the wealth of older generations.
The only other way this proves false is if there is a massive wealth destroying event such as war, revolution, ecological collapse, etc. such that there isn't much wealth to inherit.
The IRS can!
That said, I was talking about a generation collectively across all of society, not a specific family.