Quoted from MrBally:Best advice I have is to (if you don't already have one) get a four year degree in business in case the shop has to close say, due to a change in regulations so you have something to fall back on.
You may not be able to get your prior job back due to internal changes or your age.
What happens if you have marital issues? It would be terrible to lose spouse and employment at the same time. Make sure you have some time of agreement that protects you down the road.