how to bond with boyfriends siblings???

Kaylee
My boyfriend and I have been dating for just over a year now. I am 15 and he is turing 17 soon.  We have a great relationship and hang out all the time.. i have no complaints other than the fact that i can't ever seem to bond with his younger siblings!!! He is the oldest of 5, the youngest being 6 and the second oldest next to him is a 13 year old girl, which is my only sister and siblings age ironically. I feel like I should be able to bond with them considering I see them often but it seems impossible! Over the summer we went to his uncles house a lot to swim and I even stayed at his family's beach house for a week, where I did begin to slowly bond with the kids but now it feels like they think they can't talk to me or are scared of me even though I always smile at them and say hi. I'm not the most outgoing person but I have no issue starting conversations with them.  I get along so well with all of my other friends siblings and family friends kids but for some reason I can never get it right with his siblings even though he talks with my younger sister all the time! I would love to bond and get closer with his siblings but i have no idea how to. Any advice??? 

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