Is it wrong to date a friends' sister?

Patternman
There has nothing happened yet, but i matched with my friends sister on Tinder and i really want to talk to her (i sent her an opening line and she responded very friendly-ish)

The thing is that she is the sister of my brothers best friend. I hang out with my brother and his friend a lot so i think it's a little weird to flirt with his sister. What do you think?
Is it wrong to date a friends' sister?
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