In reading, he's still pretty normal. He can read a little, but it's all instruction from me, not spontaneous like his sister. Then again, his sister is opposite: reading was spontaneous, math was through instruction.
It's funny, we have one of each as well. DS6 is quite strong at math but learning to read is slow. DS5 seems to need instruction for math but has learned to read spontaneously. He now reads joke books to us from bed (when he's supposed to be reading quietly, but who can complain?!).
Have you tried the Bedtime Math books with them? Our boys just love them.