Scores aside, we made the mistake of assuming DD4 was the same child as DD9. DD4 is a "difficult child" but it dawned on us only recently that part of her troubles come from trying to understand us. At her age, DD9 followed complex adult conversation quite easily. It became the norm in our house. Meanwhile DD4 is struggling like mad to not only be just like DD9, but to also comprehend what everyone else in the house is saying.
On a side note, for us IQ tests were only useful to open our eyes to understanding gifted issues and asynchrony, which we knew nothing about until the test. I don't trust the numbers much. A bad breakfast or flaky tester can skew enough points to mislabel a MG child PG and vice versa.
