On the first Sunday in August, the August 01, 2021, Sisters Day is observed. It is all about having a sister or being one. A female sibling is called a sister. You can celebrate Sisters Day by spending time with your sister und making her a special day. If you are a sister to a brother, give him the chance to appreciate having you on Sisters Day, like he should actually do every day.
Sisters share a lot during their childhood, they fight and make up, they love, hug and kiss each other, but most certainly they also annoy each other from time to time and play tricks on each other. However having a sister is not replaceable although some girl friends can be like a sister, too, as they feel connected to each other just the same.