Can i get X1 type for my children as well , what is the procedures?

Hi, you can try to extend your current X type 7 days earlier before it expires at the exit and entry administration of local PSB. If it can be done, you don't need to leave China. As for your children, if they want to study in mainland China, they need to apply for student X type. Otherwise, they can apply for S type to stay with you in China. The required application is the same as your application for student X type.