I can read my older brother's mind. He cannot, however, return the favor. It's a younger sibling thing. My younger brother can finish my sentences as well.
Growing up I could never say my older brother's name (Dale), I called him "Dee-doo" until, at age 10, I realized how silly I sounded. The first couple weeks of calling him by his real name was almost painful in its alienness to me. But, after a while, it felt natural. Similarly, my boyfriend calls me "Wookie" so much (the hairy chest) that when he actually uses my real name, I have to think for just the barest fraction of a second about who he's referring to. It almost feels unnatural when he says, "Hey, Dan."
~String