Hi Alyssa, Just tell your mom in law politely that if she teach palo to your sis in law, the child will hit other people as well... try to tell her that an innocent child will accept all the good and bad teachings altogether so it is very important to teach the right things at the start. Hope you are able to sort out the right things with your mom in law.
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I'd like to assume that it's for disciplinary purposes. If it is, it is their right to practice "palo" to their own child so as long as it wouldn't gravely hurt him/her.
Alyssa Francisco