Dad fell, refused the ambulance, and told you to go home. You have his power of attorney in a folder. The temptation is to produce it like a badge.
Local option: New Plan Care gives families in the St. Louis area in-home help so a parent can stay home: companionship, help with bathing and dressing, meals, and overnight care. Call (314) 405-0887.
Do not.
In Missouri, a power of attorney can let you act for Dad within the powers written into the document. It does not give you a general right to make him act against his will. Missouri law expressly limits an agent's power to require the principal to take or stop an action against his wishes. The governing statutes and public guidance are collected on the Sources page.
That leaves you with a harder job: identify which problem is actually in front of you.
The first problem is authority
A power of attorney is not one standard form. It may cover finances, personal care, health care, or a narrow transaction. It may work immediately, or it may require a stated event before the agent can act. It may be durable, meaning the authority can continue through incapacity, or it may not be.
Read the document itself. Do not rely on what Dad called it when he signed it. Find these points:
Who is named as the first agent? Is that you, or are you the backup? Does the document say the agents act separately or together? What subjects are actually granted? Is health care included? Does it say the authority is effective immediately, or only after incapacity is established? If incapacity must be established, who decides and what written proof is required? Is there a later document that revoked or replaced this one?
If the paper does not grant the power you need, being the son does not fill the gap. If it names your sister first, your copy does not promote you because you arrived first. If it covers banking, it does not automatically authorize medical decisions.
The second problem is disagreement
Dad can understand what happened, explain the options, describe the likely consequences, and still choose the option you would not choose. That may be stubborn. It may be poor judgment. It is not automatically incapacity.
Test the decision, not whether you like the answer. Ask him, in plain language:
What happened? What help is being offered? What does he think could happen if he refuses it? What is his plan for food, the bathroom, medication, the stairs, and another emergency? Can he explain the same plan again without you supplying the missing pieces?
Do not turn this into a courtroom cross-examination in his kitchen. You are listening for whether he can receive information, weigh it, communicate a choice, and connect that choice to the practical consequences. A bad answer and an answer you hate are not necessarily the same thing.
If he understands and keeps saying no, the useful move is usually to shrink the request. Ask for one task he will accept: unlock the door for a neighbor, move the phone within reach, let you bring dinner, stay on the line while he walks to the bathroom, or agree that you will call emergency services if he misses a specific check-in. The side door is cooperation, not a paper ambush.
The third problem is possible incapacity
The line changes when Dad cannot understand or evaluate the decision, cannot communicate a stable choice, or cannot connect his refusal to essential needs such as food, shelter, safety, or care. Missouri guardianship law looks at functional ability and the risk of serious harm. It also requires consideration of less restrictive ways to meet the need before a court removes decision-making authority. Those standards are among the legal materials listed on the Sources page.
Look for facts, not labels. Write down what you directly observed: he could not say how he got onto the floor, he believed the disconnected phone was working, he could not identify how he would reach the toilet, or he gave mutually incompatible answers within the same conversation. Record what was offered and what he appeared unable to understand. Do not write that he was crazy, impossible, or unsafe. Those words conceal the useful part.
A diagnosis by itself does not answer every decision. Capacity can depend on the particular choice and the particular moment. A man may be able to choose dinner while being unable to understand a complicated property transaction. A power of attorney also does not itself declare him incapacitated. Read the activation language before claiming that it has happened.
Know when tonight is no longer a paperwork problem
If Dad may be seriously injured, cannot get up safely, cannot be reached after circumstances suggesting immediate danger, is exposed to fire or gas, or appears suddenly unable to understand what is happening, call emergency services. Tell the dispatcher what you observed, what you cannot verify, how responders can enter, and whether weapons or animals are present. Do not lead with the family argument. Lead with the condition and the risk.
If the danger is not immediate but you believe he cannot meet essential needs or may be experiencing abuse, neglect, or exploitation, use the agencies and numbers collected at Local Help in St. Louis. A report is a request for assessment. It is not a private declaration that you now control his life.
Guardianship is a court process, not an upgraded power of attorney. The court examines evidence, Dad has procedural rights, and any authority granted may be limited. If the facts are heading there, take the document and your incident notes to a Missouri lawyer who handles probate or elder law. Ask what less restrictive options must be considered and what evidence would actually matter. Do not ask how to take over. Ask what authority is necessary for the specific unmet need.
Your next move tonight
Put the power of attorney on the table and mark four passages: the named agent, the subjects granted, when the authority begins, and how incapacity is established. Then write one sentence describing the decision Dad is refusing and three facts showing what he does or does not understand about it. If the facts show immediate danger, call emergency services. If they do not, offer one smaller piece of help he can accept and take the marked document to the right professional before you claim a power the paper may not give you.