I think my family is a clone of yours! Dh is a technology geek. He reads the same sci fi/fantasy books over and over. He is a computer systems analyst. I have the older DD like yours who wasn't quite as good at decoding but is much more interested in reading. And the younger, reluctant DS.
Don't know if this makes you feel better but I have noticed a big improvement in DS in the last year or so. I don't know if he will ever like chapter books, but he does seem to truly enjoy nonfiction or certain picture books. Gernonimo Stilton is another series you could try. DS hasn't gotten into it but other parents have recommended it. It is hard with such little kids finding reading that is advanced enough but with appropriate content for their maturity level.
