Legal Question in Wills and Trusts in California

Not unless he makes her one in accordance with the terms of the trust, OR he revokes the trust and establishes a new one.

Very likely you will no longer be an heir. Time to polish up your resume.

Under the typical husband and wife trust, a portion of the trust becomes irrevocable when the first spouse dies. Often, however, the surviving spouse does nothing to divide the assets as the trust provides is to be done. Your father's new wife will not automatically become a trustee of the trust but there is nothing to prevent him from taking assets out of any part of the trust that is still revocable by him and putting them into new accounts, or a new trust, with his new wife. The best thing for you to do is discuss your concerns with him and encourage him to sit down with an estate planning lawyer to make sure everything is done correctly. At the end of the day, if it is his money, he can do what he wants with it.

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She wouldn't automatically become trustee of the trust, but nothing stops him from creating a new trust instrument for himself, and including her and excluding you.