My brother's sister is like a treasure. What are they?

Brother You's sister is like a treasure. Tell me about it:

1, good brothers and sisters, for the sake of life, travel together, go shopping together, take photos together and eat delicious food together.

Happiness means that even if you don't have a boyfriend, there will still be a dear brother/sister who loves you.

3. Brothers are lovely girls, but only women without brothers.

I want you to be my brother if I have next life.

The biggest difference between me and my brother is that I study hard at school, get up earlier than the chicken, go to bed later than the ghost, and be in the top ten in my class. My brother studies at home every day and works like a pig, so the first throne in school is still his.