Did you first have the client SIGN A CONTRACT for a 'family event' coverage (vs. the defined term 'wedding coverage')?
If you made a clear distinction between the two, and the client signed the contract for 'family event', then legally the court would rule that there WAS NO CONTRACT to enforce, because there was not a 'meeting of the minds' between the two parties in the contract.
As a result, you could WALK AWAY from performing the coverage...no contract made, no contract broken.
It would help for there to be identifiable differences in the 'product' provided, for you to justify the higher price for 'wedding coverage'.
I know that I would routinely spend much more time (10-12 hours on the job) just to shoot a wedding; I would never be 'on the job' for that long simply for a typical 'family event'. But 10hr vs. 2hr hardly seems to be a reason alone to justify double the price...what else makes 'wedding' have greater 'deliverables'?
I suspect any court would consider spending 10 hours vice 2 hours ample enough reason to charge double...but I suspect the courts wouldn't wade into a judgment of what a photographer's price list ought to be anyway.
The question would be whether the photographer made his prices clear beforehand and whether there was a clear distinction in the marketing materials between one service and the other.

