Robert T. Kiyosaki grew up with two dads: a rich one, and a poor one. He believes that had he only had one dad, he would have had to simply accept or reject his advice. Having two dads offered him the choice of contrasting points of view: one of a rich man and one of a poor man.
Neither of the two men gave the same advice, and here we see four examples of the contrasting advice he got, from his book Rich Dad Poor Dad.