23 Pa.C.S. § 5614: Revocation.

(a) Prepetition.--Prior to a petition being filed under section 5612 (relating to petition for approval of a designation), the designator may revoke a standby guardianship by simple destruction of the designation and notification of the revocation to the standby guardian.

(b) Postpetition.--After a petition has been filed, the designator may revoke a standby guardianship by:

(1) executing a written revocation;

(2) filing the revocation with the court; and

(3) notifying the persons named in the designation of the revocation in writing.

(c) Unwritten revocation.--Regardless of whether a petition has been filed, an unwritten revocation may be considered by the court if it can be proven by clear and convincing evidence.