A younger brother tying his sister's hair is a way to show the intimate relationship and care between brother and sister, and it is also an opportunity for his younger brother to exercise his skills and take care of others. As long as the younger brother is of the right age and has certain hairstyle skills and safety awareness, then you can try to tie your sister's hair. If you are really uneasy, you can operate with the help and guidance of adults.
Don't pull your hair excessively to avoid scalp pain and hair loss. Because everyone's hair, face and temperament are different, make appropriate adjustments and changes according to personal circumstances.