This kind of thing is first of all that you have to be prepared to protect yourself, and in all probability, once you make trouble, the most innocent person is you. The second is to communicate with the mother first because of what is the reason for the cheating and how to solve it. If your mother still can't turn back, then talk to your grandparents and father about it. The most important thing is to protect yourself and protect your rights and interests.
In this process, you should first ensure your own safety and interests. If you are a minor, you need to seek help and support from an adult, such as communicating with your father, mother, or other loved ones. If you are an adult, you may consider seeking legal assistance or consulting a professional to ensure that your rights are protected.
When communicating with your mother, you can try to understand why she is cheating and how she plans to solve the problem. Some people may choose to divorce or separate in this situation, while others may choose to seek counseling or resolve the issue. Either way, you need to make sure that your interests are protected and that you do as little harm as possible.
If you feel unable to resolve the issue with your mother, you may consider seeking help. You can ask your father, grandparents, or other loved ones for help to understand the situation and help you make decisions. During this process, you need to stay calm and sane, learn as much as you can about the situation and listen to their advice.
Finally, you need to protect yourself. This includes ensuring that your safety and interests are protected, as well as avoiding further harm. If you feel the need to seek professional help, you may consider consulting a psychologist, social worker, or other professional to help you deal with the situation and support yourself.
In conclusion, in this situation, you need to stay calm and take appropriate action to protect yourself. At the same time, you also need to seek help and support to minimize the harm you have done to yourself.