I have never heard cascade used quite this way. As you know, a cascade is a waterfall, especially one that descends through a series of small pools. Therefore, to say that Money and Tory politics cascade through his family implies, to me anyway, that they have been prevalent and come down through generation after generation.
The use of cascade in your example causes me to pause a moment to fix the image in my mind. So, if you were use it to say 'destitution/ misery/happiness cascade through him', it would sound unusual to me. I think to use this word figuratively, you would need to be certain that you want to create the image of the emotion falling in abundance in a continuous stream, moving from pool to pool.