Anyone who is still only meeting people outside in 2022 in insane and not living based in reason or science.

Sounds a bit on the extreme side, but still within normal range of behavior. She's the mom and it's her job to protect her baby, and she gets to decide. She's not abusing or hurting the child - just inconveniencing you. So butt out.

Now that vaccines are available to infants, I wonder if the sister will vaccinate her baby and drop all the hygiene theater? Most of my friends with babies and toddlers are chasing down appointments to finally live/resume normal life…