How to deal with these shrewd relatives?

If you want to deal with particularly shrewd relatives, you need to be objective and fair first, and don't let personal prejudice affect your attitude towards them. Secondly, you should be good at communication, communicate effectively with them, understand their ideas and needs, and try to meet their requirements. At the same time, you should also pay attention to protect your rights and interests, and don't be used by them. If you encounter difficulties in communication, you can ask a third party for help. In short, dealing with particularly savvy relatives requires patience, good communication, objectivity and fairness, and protecting one's rights and interests.