Legal Question in Wills and Trusts in California

It depends on the terms of the trust. It might be 100@ revocable and amendable, or part of the trust might have become irrevocable on your husband's death. You can always amend or revoke as to your 1/2 interest in community property assets and your separate property.

The trust instrument itself will govern the response to your question. You should be able to revise your portion, but whether you can change that of your husband is entirely dependent on the actual trust terms. It is probably desirable to engage counsel to advise you on the issue, and to assist in any revisions you intend.

It is most likely that you can amend your half of the trust.

You are going to have to consult with an attorney in more detail. It is not clear if you have what is called an "A B" trust, which is only half amendable, or something else.