Here's the thing. His rich dad is fictional. He doesn't make money the way he tells you to. He's not a real estate mogul. He make money selling books and seminars. If the advice he gives were so great he'd be Donald Trump ten times over.
And he does cooperate a lot with Trump: http://www.amazon.com/Why-We-Want-You-Rich/dp/B0013MN78Q/ref...
At the very least they have written several books together.