My mother put her house in an irrevocable trust before she got sick — can we undo it?

The mechanism depends on her situation. If your mother is alive and has capacity, the cleanest route is Prob. Code § 15404: she and all the beneficiaries can modify or terminate by written consent, with no court involvement at all. If she is alive but no longer has capacity, the § 15404 door is closed, because she cannot consent. What remains are the court routes — a petition under § 15403 if all the beneficiaries consent, or § 15409 if circumstances she did not know about and did not anticipate would defeat or substantially impair the trust's purposes — and, if a conservatorship is already in place or is being sought, a substituted judgment petition under Prob. Code §§ 2580–2586 for authority to amend or revoke a trust or transfer property. Conservatorship work is not something this office handles, and Bob would refer you to a California attorney who does. If your mother has died, the same § 15403 and § 15409 routes are what is left. One more thing to check before you move on any of this: the Medi-Cal asset limit was reinstated effective January 1, 2026 at $130,000 for one person, so pulling the house back into her name can change her eligibility picture, and the sequence in which you do things matters as much as the paperwork.