Wow, jckdw and greenlotus, those do sound like tricky situations. I'm sure it takes a lot more deliberate parenting around sibling issues that for families that don't have these kinds of accelerations to cope with as well!
Have your older children been tested for giftedness? I'm thinking we may test my daughter. I'm not sure she's gifted, but she's certainly very bright, and at times it could be helpful to discuss that with her if there is any sign of her thinking she's not very smart because of (her own or her classmates') comparisons to her little brother. Plus, if she did turn out to be gifted, then she too would get some kind of accommodations from the school.
