Among the many provisions of a trust,  is the right to be able to pass rights of inheritance to whomever is designated,  as well as their heirs of the designated person beneficiary, if the designated beneficiary has not survived the maker of the trust, Trustor. The provisions of the distribution of the trust as to whom and how much, are supposed to be mirrored by the provisions of the pourover Will, if a pourover will is executed by each of the parties to the trust in conjunction with the trust, meaning the same distribution scheme. Typically, the during life trust provisions prevail, vs a will is an after life distibution document. You are advised to seek the services of estate planning lawyer to review the trust with all three of you contributors as to the distribution scheme, to clarify the rights of heirs, as well as the contributors to the trust.