AITA for waking up my baby sister?

I (F 18) live in a 2 and a half bedroom house with my cousin her fiance her friend and her boyfriend. My mom (35) and step dad (41) decided to come over uninvited and without any warning. Yes I know thatd normal for some family's I told them not to unless its an emergency because I work and I live with 4 other people plus a dog. I was home and they brought my baby sister (1 month) over. I told them that they could stay for a bit because everyone didn't care but I was about to make food and it might wake the baby up if she fell asleep. They said ok to no surprise my baby sister fell asleep. I asked them if they wanted to leave and they said no. So I started cooking I had to use the oven which is very musical and the microwave plus I was making ranch for my cousin. The blender woke my baby sister up and my parents FREAKED OUT. They yelled at me and told me I could have waited. Which no I couldn't because ranch needs about 30 minutes to 2 hours to thinken in the fridge. When i told them that they said I should have told them I would have been loud. I already did and they said it was fine. My roommates say im not that asshole but I wanna know what you guys think. AITA for waking up my baby sister?