Remember where you came from-it's a good place. Remember the good and the bad and look at your game then and now (I know you probably have but look at it as though you are reflecting on what you have accomplished in golf). With all the respect in the world for your DAD, he would tell you this "just play the game". Don't add anything else to it because you are still the best at what you do.
I respect your decision on letting Mr. Williams go and do good things with another golfer. You have accomplished more than most golfers have with Williams, but remember as a team we all grow/as a individual we all grow (from start to finish) and sometimes you have to respect the growth or need to grow and separation this may cause due to life.
The bottom line is go back to your roots and just play the game! You are the best at what you do.