I do not know about the indefatigable brother, I think he got tired) Sisters certainly are all on the positive. The way they got caught by their mother and the brother hid, it was well thought out. But then when they went on and the mother, or whoever she is I don't know, was sitting next to them, I didn't understand why they did that. It was nice to watch, especially the sisters, the brother was kind of passive in the clip, he was almost never even shown.
His brother decided that his sister has no right to refuse him, and he was right. She does not mind messing around with him. And her parents are happy that she is always on time at home.