Oh dear.. this is tricky.
I’m sure you don’t need any more information on how second- and “third-” hand smoke is harmful to anyone.
Perhaps you can ask your husband along when you bring your child to visit the doctor. This way, it will not be coming from you, but from a medical professional. Hopefully, this way, your husband may be more motivated to speak to your in-laws and to enforce what they have promised.
Otherwise, I would suggest bring along disinfectant wipes to clean your child when you are out with your in-laws. May not be nice but at least, can wipe off some of the lingering third-hand smoke after contact with your in-laws?
Not sure if these will work.. just some suggestions.
Hope your husband could help speak to your in-laws again.
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