That's funny, because I have suspected that my first cousin might be on the spectrum as well when he visited our family recently.
It was my first time seeing him in about 14 months, and I had went through my ordeal of finding about my apparent lifelong ASD from the last time we met. I notice my cousin doing similar things that I did, or symptoms of the spectrum. Such as having conversations by himself (I was thinking nothing of it before since he was an only child for 11 years), attachment to inanimate objects (he was spinning around with the yardstick that I usually 'fiddled' around with), and his intense obsessions (first Sonic the Hedgehog, which was for a few years, and now its Anime with Naruto/Dragon Ball/etc), and well, and possibly his eye contact ( I can't really tell b/c of my issues with it). He absolutely loves to play video games, as he plays them practically when he awakes to when he sleeps. And they usually are what he's obsessed. Me and him have a unique connection, too. 