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Do you think he likes her?

My sister diana is 13, and our considered-cousin friend hunter (14) who lives 8 hours away um well, he might like her, she has been on and off crushing on him. And we've all known each other since we were little toddlers. Here are some suspicious events...lol

-when diana was playing wii boxing hunter came up behind her and like grabbed her hands and starting "helping her win"

- on our pontoon they were being really playful, pushing eachother off the boat etc.

-our parents were teasing and saying how they could get married.

-people around them notice the behavior

-we were playing a board game, and he would never ask me any questions, just diana (and they were questions I could have answered too)

-they are always talking, and he like knows where she is all the time

I personally think he likes her, but maybe I'm just reading this wrong. What do you guys think? More than friends, or just buddies? Sorry this is so long too! Thanks in advance for the answers, any opinions appreciated!
No, hunter is not our cousin, we have know each other a long time and we are all close so I just say he's my cousin, but we are just friends
YES! I knew he did, I knew it! Now I want them to do something, like start dating... Spice things up (lol)

If any of you are wondering diana is older than me ;)
Thanks ALL answers! Not one person said he didn't, so I'm just going to sit back and watch this show lol. I had to choose only one answer for BA, sorry about that.