What it means in practice
Guardianship (called "conservatorship" in California and some other states) is a court-supervised relationship where a judge declares an adult legally incapacitated and appoints someone — typically a family member, sometimes a professional fiduciary — to make decisions on their behalf. The proceeding involves filing a petition, serving the alleged incapacitated person, a court-ordered medical evaluation, sometimes a court-appointed attorney for the patient, a hearing, and an order. It typically costs $3,000–$15,000+ in legal fees and takes 2–6 months. After appointment, the guardian files annual accountings + reports with the court.
Guardianship is invasive: the patient loses the legal right to manage their own money, sign contracts, refuse medical treatment, choose where to live, and often the right to vote. Once granted, it's difficult to undo — even if the patient regains capacity. Some states have implemented "supported decision-making" alternatives that preserve more rights, but availability varies widely.
Families end up in guardianship court for one reason: the parent lost capacity BEFORE signing a durable power of attorney + healthcare proxy. Every elder-law attorney's constant message is "do the POA package now, while you can, so your family never has to file for guardianship." The $500–$1,500 spent on a POA package is often the most consequential legal expenditure a family ever makes — measured by what it avoids.