Oh my, this seems like a tricky and sensitive situation. I recognize that some grandparents assume that they know better. I respect their beliefs but if it is unhealthy for the kid, then something must be done. Have you tried meeting in between? Yes, let your FIL feed your child, but how about you prepare the meal and the portion. Put each portion of milk in a container for mixing later, then hide the milk can so he can't top up anymore :-D Or better yet as someone suggested, bring him to see the PD so he can listen firsthand from the expert. Obesity in childhood may cause obesity in adulthood. This is proven science. I hope you can get this resolved soon :-)
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