I agree with not telling. My mom told me both mine and my brother's when we were in highschool. I think she thought she would make me feel better because my number was pretty good. It really bothered me even though I always knew he was smarter than me. We had an 11 point difference but that put me in the moderately gifted and him in the highly gifted categories so performances were noticeably different.

Both our parents have passed on so I told my brother his number and he was surprised his was that high. Good-luck whatever you decide.