One of the things I have learned is never underestimate the sibblings, I have DD5 and DD4 (19 months apart) the 5 year old has what I beleive to be a photographic memory and has always wanted more and more info to learn, my 4 year old is a throw back from the 60's and is a free sprit loves to learn but does not have the same type of drive the older one has (a perfect balance for my 5 year olds perfection personallity) about 2 1/2 years ago when DD5 then almost 3 desided it was time to learn the months of the year, she was going through the calendar reading the months over and over (she learn to read before 2yrs), I told her to put it down and try it without looking. She said " January, February, March" and then she paused for a moment and little sis pipes in "April, May, June, July,August, ect....