One of my clients is an extremely successful lawyer and owns multiple businesses. I was in his home office one day to collect a check and ask for some advice on a person who was not holding his own on a renovation project we started. His only words were "I've been a millionaire and broke more times than you can imagine, and the best advice I can give you is the only time you ever want to be in business with a partner is if that partner is your wife. If she ends up not working out, she will take 50% anyways"
My boss is a total jerk!