What is the relationship between the sub-case and the parent case in the divisional application?

Divide relationships. According to the relevant information of the divisional application, the relationship between the sub-case and the mother case in the divisional application is divisional. Division application, as the name implies, is to separate one or more new applications (called "sub-cases") from the original patent application (also known as the parent case), and the sub-case can inherit the application date and priority date of the parent case.