This is also a bit of an issue here, specifically around chess. If they play 10 games, DS5 will probably win 7 and DD10 will win 3. Or maybe it's 6 and 4, but I don't think so. DD is NOT bad at chess, but DS is unusually good. DD definitely does not love this situation. However, she is sort of okay with it...as long as he does not beat her at other games a lot. Which he has a tendency to also do, if they are strategic.
They also occasionally read some of the same books now, though this is because DS is reading "up" (and probably somewhat past his comprehension) and DD is reading "down" (because something is high-interest). But it's a little weird and she recognizes this.
DD is proud of her brother and often comments (too often, actually) on how he is not a "normal" kindergartener and "regular" kindergarteners can't do what he does. But they have a terrible sib rivalry situation as well and I am pretty sure insecurity about his abilities is part of it. He is also a sunnier and better behaved personality. This does not help. We definitely struggle with this here.
