(decedent's revocable trust named son sole trustee and gave beneficiary power to direct trustee in righting to retain distributions; trust also contained creditor protection provision for beneficiary; upon decedent's death, debtor received $20,000 from trust and then filed Chapter 7 bankruptcy; trustee sought distribution scheduled to be made post-petition, but debtor (as beneficiary) instructed trustee in writing to not make distribution; bankruptcy trustee's motion for summary judgment not granted because trustee properly withheld future trust payments).