It doesn't absolve me for breaking the contract, but it puts others on the hook too - my liability might very well be lessened by the fact that others share responsibility.
And I have a kid who's starting golf lessons, so maybe you're available on weekends this summer? ;)
General, I am always available to play golf. A teacher I'm not, more a gambler, with strokes of course. :-}
I hope your son enjoys it, I know I do and I say that as an ex jock who used to ridicule the sport until I got hooked at the age of 46.