20 Pa.C.S. § 7746: Overdue distribution - UTC 506.

(a) Distribution not made within reasonable time.--Whether or not the interest of the beneficiary in the trust is subject to a spendthrift provision, a creditor or assignee of a beneficiary may reach a mandatory distribution of income or principal, including a distribution upon termination of the trust, if the trustee has not made the distribution to the beneficiary within a reasonable time after the mandated distribution date.

(b) Definition.--As used in this section, the term "mandatory distribution" means a distribution of income or principal that the trustee is required by the terms of the trust to make to a beneficiary, including a distribution upon the termination of the trust. The term excludes a distribution that is subject to the exercise of the trustee's discretion regardless of whether the terms of the trust include a support or other standard to guide the trustee in making distribution decisions or provides that the trustee "may" or "shall" make discretionary distributions, including distributions pursuant to a support or other standard.