My parents-in-law think about my sister-in-law. My sister-in-law doesn't care about my sister-in-law and my brother at all. She should be a wife.

As a daughter-in-law, you can try the following methods to deal with this situation:

1. Respect your in-laws' decisions: If your in-laws decide to give your aunt more care and attention, as a daughter-in-law, you can respect their decisions. Don't try to interfere with their decisions or criticize their practices.

2. Try to establish friendly relations with your sister-in-law: Although your sister-in-law may have no respect for her sister-in-law and brother, you can try to establish friendly relations with her. By communicating with her, understanding her hobbies and ideas and enhancing mutual understanding may help your relationship to be more harmonious.

3. Seek your husband's support: If your husband is also dissatisfied with this, you can communicate with him and discuss how to deal with this situation. We can make some family rules together to balance the concerns and responsibilities of in-laws and sisters-in-law.

4. Seek professional help: If this situation seriously affects your mood and family relationship, you can seek professional help. For example, you can consult a family therapist or psychologist for better advice and support.

In a word, dealing with this situation requires patience and understanding. Try to stay calm and take positive actions to ease family tension.