My own parents did the same to me, I was chased out of the house when my Husband was overseas - just because I was 'defiant' and insisted that LO not have more than xx formula feeds a day ( I have more than enough breastmilk but they claimed that formula is best for a growing child).
That was when I was still living under their roof, alone with LO, because they aren't comfortable with a stranger (my Husband) walking around the house.
I totally understand how you feel. If you guys had the option to stay somewhere else, going now after this argument would cause matters to be worst. As much as you don't wish to hear this, you can only get out of this situation after you've shifted, and your LO is taken care of solely by you/ childcare in the day and night by you.
So for now, have to grit your teeth and just try to unteach bad things when you can, but correcting your folks will cause more hurt (either ways) and if I were you I'd avoid these confrontations as it gets really tiring and bad for kiddo to witness.
Congrats on bb no 2 btw!
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