How to reject a photo shoot client who is also sort of a friend?

A guy I am acquainted with has asked me to do a photo shoot of him for various reasons, and I was fine with it, but my parents can't stand the guy and said that I should not do the shoot. I respect that and I'm okay with not doing the shoot for him, but how should I write the "rejection" letter? I don't want to let on that my parents hate his guts, but I have no other valid reason to say no. How should I reply to his email?
I live with my parents, I can't drive myself, and it would save me a lot of trouble if I just declined. I was told to either say no or charge him a ridiculous amount of money.
I live with my parents, I can't drive myself, and it would save me a lot of trouble if I just declined. I was told to either say no or charge him a ridiculous amount of money.
 
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