How can I synchronize the visa duration for my education and guardian visas in Thailand?

This group is always useful, as usual! We are currently in Thailand thanks to an education visa and a guardian visa. However, due to the expiration date of the guardian's passport, there is a difference in the visa expiration date compared to the student's. I would appreciate any guidance on how to catch up on the visa duration and ensure that both have the same visa duration. Many thanks!!