In most cases like this, my advice is to always try and have a discussion with the person in question. Perhaps his ideas have some actual thought behind them that you may not see right away. Perhaps they are nothing more than him trying to put his stamp on things. They may also be coming from above, as said before. In my experience, even when questioning a manager's opinions and decision, if you can keep a professional manner and speak with them directly about it, things will turn out better in the long run for both of you. If you go around him to the boss, and nothing changes, but he finds out about it, he will not be happy, and your situation will likely not improve as long as you both are employed there. If you go around him and go to the boss's son, I think this may be even worse, as the only thing he can do about it is to talk to his mother. This brings you back to the situation above, except it has added another layer of mistrust into the mix. At that point, youmight as well start looking for a new job.
So my suggestion would be to have a good discussion about the new boss's ideas. Compare them to what is in place now, and try and hammer out details as to why one is better than the other. Perhaps there are some good ideas hidden below the surface of his thought process, that may not be the best by themselves, but could be easily incorporated into the current setup and be beneficial to all. If he tells you to not worry about it and they are his decisions to make, and just do what you're told, then it becomes a personal decision on whether this is a postion you want to remain in.