When this woman is weirded out by her SIL's behavior, she asks Reddit:
I 26 (f) live and 2 of my siblings 35(m) 40 (f) still live with our parents. This is not in the US. My other sibling 30(m) got married last year and had a baby with SIL.
They are not doing well financially so my mom offers to let them sleep over for a week so they can save on bills. Now onto the situation, my SIL breastfeeds which is normal but after she just goes around the house with no shirt on.
We have no problem if she does that in their house but my brother, father and granpa feels awkward about seeing her tatas just hangout after in a shared environment.
I confronted her saying theres no problem with breastfeeding but please put a shirt on after. She called me an AH saying its normal after breastfeeding.