Thanks YesWay. That's embarrassing because most of Asian culture are that way, especially my own. Since I read the Eng-Sub and from the Video contents my thought went down the actual context.Bear in mind that in Japanese, they frequently use family words like "sister", "uncle" etc to refer to people... but not just family members - they'll use those terms even for complete strangers, in the same way that we might use "Miss", "Mr/Sir" etc.