A Trust can always be amended by the creators of the trust, unless the trust is an irrevocable trust. Irrevocable trusts are uncommon, and only used in special circumstances. Most trusts are revocable and can be changed via an amendment. The amendment can change the distribution of property, names or number of beneficiaries, the list of trustees for the trust, or virtually any other item.
The amendment to the trust has to be executed in the same manner as the trust itself to be effective—that is, notarized signatures by all trustors.
The one exception to this is in the case where two married people have a trust together and are getting divorced. In that case, you cannot change the trust unless both parties agree to do so. Most trusts have provisions that allow you to revoke the trust during the divorce process, but you need to have your trust attorney take a look at the provisions of the trust before you make any decisions during the divorce process.
Another exception is in trusts where one of two trustors has died, triggering a clause in the trust that makes it irrevocable. At that point, there can be parts (or all) of the trust that may no longer be changed, based on the terms and clauses in the trust regarding irrevocability.
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