When chatting with girls, she often talks about her family, such as how my sister is and how my brother is. Why?

There may be many reasons why a girl often mentions her family. Here are some possible explanations:

1. She thinks family is very important: a girl may cherish her family very much, so she often mentions them in conversation. This shows that she feels that family is an important part of her life and hopes to show her family values by sharing family affairs.

2. She wants to share details of life: Some girls like to share details of life, including family affairs. This may show that she has a good impression on you and hopes to enhance the connection between you by sharing her life.

3. She wants to know your background: A girl may mention her family in a chat to understand your background and family situation. This will help her get to know you better and have a deeper understanding of your life and values.

4. She wants to show her personality: some girls may mention their family in chat and show their personality to others. This may show that she is a person with family values and family consciousness, and hopes to show her family values by sharing family affairs.

It should be noted that everyone's behavior and expression have different reasons, which need to be analyzed in detail. If you are confused about a girl's mind, you can ask her directly, or observe her behavior and words to understand her real thoughts.