My boyfriend’s relationship with his sister is weird?

My boyfriend is the same age as i am, 19 yrs old and his sister is 17. They are very very tight although they haven’t grow up together but they treat each other like friends. When I got to know her I noticed some weird stuff- at least weird for me. They’re very playful with each other, plenty of long hugs,... show more My boyfriend is the same age as i am, 19 yrs old and his sister is 17. They are very very tight although they haven’t grow up together but they treat each other like friends. When I got to know her I noticed some weird stuff- at least weird for me. They’re very playful with each other, plenty of long hugs, piggyback rides and back hugs, he takes her to the movies and fancy restaurants and he lets her wear his clothes and sometimes they even cuddle?? I’m not sure which way it goes but it’s kinda weird to me.
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