Guys, Would you pursue a girl even if you're friends with her sister?

I'm in this situation. I like a guy he's sort of friends with my sister (she's moving country soon and has a boyfriend who she's happy with)

And he asked me to play at this festival and said he'd join I feel he's made a few small moves to test the water. That's what I'm feeling. I wondered however if the dynamic made it weird. He is friends with my sister, so he's just over four years older than me

Guys, Would you pursue a girl even if you're friends with her sister?
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