SO's younger brother moving in??

My SO wants to let his 18 year old brother move in with us to finish HS and work with my SO. We have kids and I'm a bit iffy on the whole thing bc i feel like our privacy will be a bit invaded. I feel as if i won't be able to be myself or wear comfy clothes i usually wear since it was only us before. I'm also sceptical bc his brother has liked me before and I don't want him trying anything (bc i won't stand for it) and having to tell my SO and make things bad between all of us. How would you feel? I need advice and opinions.

Btw, we are in our early 20's.

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