Anyway, there's a link in my sig that goes to a guide to the functional differences between INTPs and INTJs. Dunno if it will help, but it's there.
I think it's good for typing yourself, but I don't know how my uncle thinks. I only know how he comes across.....
I'm inclined towards INTP, because he can be very silly, and I see him as a thinker over an intuitive. I also tend to find NPs natural at explaining things. He seems like how I'd expect an NTP teacher to be.
"Charlotte sometimes dreams a wall around herself. But it's always with love - So much love it looks like everything else. Charlotte Sometimes - So far away, glass sealed and pretty." - The Cure