A bit of background before I start - I live with my husband (H) and his family, in his parents home.
Me and H were out of town for the weekend. We left Saturday morning and were returning on Sunday night. H’s sister (SIL) was visiting for the week and her husband was coming to pick her up so he arrived on Saturday night and they were leaving Sunday afternoon.
Me and H got back home on Sunday night and I noticed the bed wasn’t made up the way I usually make it and left it on Saturday before we left. So I checked under the blanket and found a hair that was too long to be mine. I had a feeling then that someone had slept in the bed. I knew it in my gut. My phone charger was also not in it’s usual place. I asked H if he knows if anyone had slept in the bed while we were gone and he replied no. I asked him to confirm this with his mum because if someone had, I did not want to sleep in the same sheets they had slept in (I should add here that I am completely against sharing a pillow and because of how sensitive my skin is, I would break out if I shared a pillow with someone).
Anyway, H asked his younger sister first (the SIL who also lives in the same house) if anyone had slept in our bed. She told him no, but that she did go into our room to get dressed (not sure why when she has never done this before and she has her own room). I told him there was no reason for the bedding to not be left the way I left it if she had only used the room to change. I had a gut feeling so I started changing the sheets anyway. At this point, my husbands mum knocks and comes into the room so I asked her if anyone had slept in our bed to which she responded ‘yes, your SIL and her husband slept in it. They didn’t want to but your father in law insisted because you both weren’t home’. I told her it would’ve been nice to get a heads up before they used our room and now I’m having to change the sheets. I was already tired from my friends wedding which me and my husband attended and the distance we had travelled, so changing sheets was the last thing I wanted to do. I wanted to just collapse in bed.
So now i’m really mad because I feel like mine and H’s privacy was invaded. Also, had they informed us they would be sleeping in our bed, I would have been fine with it as I would have known I need to change the sheets. I am pissed that they thought it was perfectly fine for me and H to come home and sleep on sheets we didn’t know someone else had been in. And also because H’s youngest sister lied to his face when he asked her.
So AITA for being mad and am I just overreacting because my MIL’s nonchalant response makes me think I’m crazy for feeling like my privacy was invaded?