Don't mind me saying, all the above advise will cause more issues between you and your in-laws.
How about respecting the main care giver ( Your FIL)?
Please note that what he did are small infringement at best, the science is not out yet on right parenting technique(feeding bah bah)
With the above said, do you invite your FIL to visit PD together?
Is difficult for parents to accept advise their children, let alone DIL. (Heard of the saying, don't teach your father how to F***)
The best is to use someone with higher authority (Your PD) to advise him or someone he will listen to(FIL's sister or brother)
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