Advice still needed!

Okay, so this is just a follow up on the entry I put on here yesterday....
I called Ben yesterday and I was babysitting my little sister and her friend. So, I was sitting in my sisters room brading Anissa's hair (<--- my little sisters friend) and I was talking on the phone with him. It was pretty much just a normal conversation.
About ten minutes into the conversation he ended up having to go and he had to call me later. But, he called me back.
Anissa was gone but I was still playing with my little sister. We were playing with play- dough. GOSH! I love play- dough. Anyways...
My sister had to get ready for bed so I went into my room and continued to talk to him. But when I was in my sisters room my sister did something really gross, but hilarious. And she told Ben that she wanted him as a brother instead of Steven. And Ben was like
"Yeah dude thatd be hella cool!"
and i said
"No it wouldnt"
and he said
"Why not, id be a cool brother?" and he laughed and yeah this went on for a few minutes of him asking me why i didnt want him as a sibling. and eventually i told him that i didnt want to like my sibling.
and he was like
"yeah but im sure you like other guys though right?"
and i told him i didnt but then he said i liked the jonas brothers and i was like whatever. i dont know if he was joking or not.
now, im usually the kind of girl that can figure guys out when it comes to this kind of stuff?
but if theres any guys out there that understand his feelings for me from what ive told you, can you translate.
because i obviously dont comprehend