If your parents disagree with getting a cat, you need to communicate with them to understand their specific reasons for objecting. These could be hygiene concerns, pet allergies, or an unsuitable home environment. After understanding these reasons, you can take steps to address these issues, such as improving hygiene or finding alternative pet options. At the same time, you can demonstrate your commitment and responsibility towards the pet to your parents, letting them know you can care for it and are willing to take on the corresponding responsibilities.

When communicating with your parents, pay attention to your tone and approach to avoid unnecessary arguments and conflicts. If, after thorough communication and effort, your parents remain firmly opposed to having a pet, then you need to respect their opinion and temporarily abandon the plan to get a pet. After all, family harmony is the most important thing, and you shouldn't let having a pet affect family relationships.