What does it mean when he wants to know your family?

Anonymous
This guy is 33 and I'm 24. He really wants to date me but is too shy to ask. He's my boss. When he has events at his job (college), he invites my younger sister to join, she's 15. He always invites me, and always tells me to bring her. He will occasionally flirt with me, and then he will sit down and get to know her (tell her personal things about himself and bond with her). Is he doing this because he is really into me, or just because it's a sexual thing. I just need to know if he sees it long term or no?
It's just sexual
He likes me
He sees it as long term
Other
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What does it mean when he wants to know your family?
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