Would it be weird if I got together with my sister's boyfriend's brother?

Anonymous
My sister and her boyfriend and 20 and 21, they have been together for almost and year and they will probably last. My sisters boyfriend has a brother and I really like him, he is 17 and I'm almost 16. I was wondering if it would be wrong if we got together. Thanks :)
Updates
+1 y
Oh he is going to be 18 soon too. and he seems to like me a lot but he is very shy when it comes to being upfront with girls. I really don't want to make the first move.
Would it be weird if I got together with my sister's boyfriend's brother?
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