The answer to this is easy: yes. However, the more interesting question is should you have two individuals serve as guardians at the same time. Remember, that as co-guardians each of you would have to agree on every decision. If you didn’t agree each of you would have to petition the court for resolution. That is time consuming and expensive. My general advice for guardianship is to have only one person appointed at a a time. If that person can no longer serve, then this person should submit a resignation with a petition from the new proposed guardian with, ideally, the written consent of the previous guardian.