That sounds like a tough spot. I would continue to trust yourself and your ideas regarding your children. It sounds like your more anxious one may really benefit from private testing with someone versed in getting the best scores from children. My DD is very aware of what people expect and will respond accordingly. Will your school accept private testing? Silverman of the Gifted Development Center has found that siblings are often within five points..I would research what she has with identical twins. Good Luck