Found this in the PA Title 20
Pa.C.S. § 6301.(b) Trust account.--At the death of the trustee or the survivor of two or more trustees, any sum remaining on deposit belongs to the person or persons named as beneficiaries, if surviving, or to the survivor or survivors of them if one or more die before the trustee or last surviving trustee, unless there is clear and convincing evidence of a contrary intent
Unless I am reading this incorrectly, it appears the funds should have been divided between the surviving beneficiary and the survivors of the deceased beneficiary.
What we think, we become.