One reason I am leery of a skip for DS is that we have a serious sibling rivalry problem, exacerbated in some ways by obvious gaps between older and younger (younger tests higher and is also socioemotionally much more skilled). DD is threatened by him already and I feel a skip would not help that relationship. (Despite this, she's been known to ask why he hasn't been skipped.)
We had process about this at our house too. Ultimately it was good for eldest to learn that others have gifts, too, and that he is not the only special sparkle-pony in the universe.
I'd say, meet DS's needs based on HIS needs, and then help your DD learn and grow and accept.
The other reason I have been opposed is that the homework load at the magnet program is developmentally inappropriate for children who are age-typical for grade, let alone those who are not. It would not be the difficulty that concerned me at all, but the amount.
That's a very valid concern. Are you sure that Magnet is the right place for him (as opposed to skipping into a program with a lighter load)?
