-Very advanced verbally
-never had eye contact issue (In fact, he almost adores eye contact...too much. He likes to make people feel uncomfortable.)
-Can be very affectionate, but definitely will push you away if he doesn't feel like. He is not adverse, though.
-Works a crowd
-Never had "ticks"
They did do extensive evaluations, but was never found to be on the spectrum. They have done a lot, because he's been a bit puzzling. They are going through the children's hospital, and they just aren't sure what is up with him.
ETA: I should note, I have always believed my sister (his mother) is a psychopath. Not the violent type. She most definitely is narcissistic. She had a lot of issues as a child as well, and a lot of darkness. His is just more disturbing.
Extremely scary. Sounds like sociopathy. He needs therapy. I am sorry.