I have exactly 15 points between my first two children. The elder is unquestionably 2e and the 15 point gap is profoundly on obvious in daily life. It's possible that #3 is our most gifted child and the gap between her and #1 may be more than 15 points. Although #1s FSIQ is rising as our remediation attempts are working (FSIQ could not be calculated at 7, but GAI around 125, FSIQ 131 at 9, though that was on the sb5, which does not test her weaknesses)