you cannot add it to the order. Please consult your attorney re this. There may be language in the Order that refers to CA statutes that would include this. If not, he or she will advise you on how to proceed.
If you've settled the matter with your brother, perhaps you could draft a stipulation allowing you to get modified orders.
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Your best approach is to discuss this matter with an estate planning attorney who handled this to begin with and see what options you might have at your disposal.