my sister ^-^

You are vague in the situation. But if she is a child it is your parents responsibility to care for her and give her money for spending. If she is an adult she needs to learn to meet her own needs with out relying on you.

I'll still love her whatever she is cos each moment is so worth and it can't be back. Each human grows, include your sister so enjoying your moment now cos it will be so sweet to remember in the next some years or whenever you're far away from your family. If she has grown to be mature and wiser girl, she will not act as funny as now. Just think for others who don't have any brother or sister, they don't have nice chance to spend as you