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I would not involve your friend. Other than being the one to give you the referral they have nothing to do with the work.
First step would be to speak directly to the son in law about the problems you see. Try to get him to resolve the problems.
Is the son in law a licensed contractor? If he is and does not solve the problem report him to his licensure board. If he does not resolve the problems I would also post reviews at places like Yelp.
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