My crush's sister is being nice to me?

Candy5
So, my crushes family, or at least his mom really likes me. He is in his lame, teenage boy stage right now so we haven't really been talking. But I went to go watch a game to see my friends playing and guys game was next, I went to throw away some stuff and my crushes mom yelled for me so I went and sat by his family for the game and eventually to watch his game afterwords. So I hadn't ever really met his sister, except she followed me on instagram a few months ago and liked ALL of my photos. (My crush doesn't even follow me!{he knows I like him and is being weird and annoying by ignoring}) Anyways, she was there and it was the first time I actually met her. We didn't talk much but I talked a lot to his mom and a little to the dad and I think I sounded quite pleasant and fun. But still.. I don't know and still questioning whether or not his sister knows that I like him... So, games over, I go home, and now we skip to yesterday, when I was hanging down town, I saw his sister, and she said hey to me (twice bc we ran into each other different times) but in a very happy and as if we were good friends kind of way and I just feel like faith is messing with me by doing this. Like of course, lets get the crushes family to like you while he is in his little boy can't grow up stage. Any ideas if this is just a coincidence or something is cooking up the love book? (fyi, we're in high school, so that should help with why boys are acting strange.)
My crush's sister is being nice to me?
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