I know that IAS says accelerating into a siblings grade is a no no, but I was wondering if anyone had successfully done it anyway. We ar looking into acceleration options for DD. Whole grade would put her in third with her brother. They are very close and we've always called them our "twins". I realize there would be possible social implications, but right now they are both ok with the idea. I doubt it will happen but am curious if it has worked for anyone.