The reality is, I chose not to accelerate my middle DD because of all the "brain washing" my retired educator mother did when she chose not to accelerate me.

I regret my decision not to accelerate her almost daily. Teachers in K and 2nd recommended acceleration, and we did not because she was one of the youngest in the class already, and (I hate to admit) based on the feelings of our older DD who has higher verbal scores, is 2E, and not a good fit for acceleration. We now know middle DD would have done well with acceleration since she was in 3/4 combination in 3rd and 4/5 combination in 4th doing the upper grade's work both years. In 5th, the school system refused to even discuss acceleration to 6th.