My older brother was grade skipped, but I was not. He was simply just in a higher grade, and no questions were ever asked. For the most part, when kids are young this just doesn't seem to matter. It's just the way things are. If your son goes straight into 1st Grade, then your daughter will probably accept the fact that he is going into 1st Grade instead of Kindergarten. Your daughter will probably understand that this is just where he needs to be. The grade skipping was never an issue with me. (Of course, there were other areas of rivalry.) smile

Good luck!