My son is 8 and my daughter 6. My son is identified as gifted and reads at a 12th grade level while my daughter is reading at an appropriate level for a 6 year old. My son was reading Harry Potter at her age. I do not think she has his capabilities in that one area but I also notice a reluctance on her part to show her best efforts because I think she fears the comparison. However, when she brought home her art portfolio the art teacher pointed out that her level of drawing perspective etc. was at the fourth grade level. Perhaps her "talents" are not in the typical academics. I had read that full siblings would often be close in IQ so I am interested to watch this unfold.