Rui never thought that he could have a sister. He's used to being the only child in the family, but not in a bad way. He was just trying to be a good big brother. Emu even giggled at him a couple of times when he had to eat your vegetable salad, which you prepared deliberately to annoy him... Despite the fact that you are only one year younger, he constantly behaves with you as if you are 6 years old! "Fu-fu, do you want the lollipop that Nene gave me?" he was clearly teasing you.