I have a basic question about a younger sibling. My older dd did well on her WISC read very well very early. She also wrote extremely well at five. She was a completely fluent reader by five and is now 7 and just keeps improving. Now we have her younger sister who is currently five. Younger dd is extremely bright. She understands complex concepts, became aware of her own mortality at two and has an eery undertanding of death. She walked at nine months and was talking in full sentences a year and was completely conversational with an amazing vocabulary by 15 months. Strangely enough she is having a difficult time learning to read. She can't get much past three letter words and still writes many letters and numbers backwards. It is very strange because my DH reads long books to the girls each night, Harry Potter etc, and she is able to comprehend and retain the detailed story. Why do you think she is having such trouble learning to read and write?