Sibling Disagreements About Dementia Care in England: Legal Powers and Resolution Steps
Why Dementia Triggers Family Conflict
Sibling disagreements about caring for an ageing parent are common across every family structure, but dementia escalates them. The disease removes the parent as the final decision-maker at exactly the moment when the decisions become most consequential — where to live, how to pay for care, whether to sell the family home.
Research from The Carents Room found that typically one adult child shoulders the day-to-day physical and administrative burden. Distant siblings may challenge decisions about care homes, property sales, or spending from the parent's savings — often without understanding the daily realities of managing someone with moderate-to-severe cognitive decline.
The result is a toxic combination of guilt, resentment, and decision-making paralysis at the worst possible moments.
Who Has Legal Authority to Make Decisions
In England, the answer depends entirely on whether a Lasting Power of Attorney was set up before the parent lost mental capacity.
If LPAs exist: The appointed attorney or attorneys hold legal authority to make decisions on the parent's behalf. An LPA for Property and Financial Affairs covers money, property, and bills. An LPA for Health and Welfare covers care arrangements, medical treatment, and — if specified — life-sustaining treatment decisions. If multiple siblings are named as joint attorneys, all must agree on every decision. If named as joint and several attorneys, any one attorney can act alone.
If no LPA exists and the parent lacks capacity: No sibling has automatic legal authority over the parent's finances or medical decisions. Banks and health professionals may require formal authority for particular actions, although clinicians and councils can still involve family in best-interests decisions and assessments. For ongoing financial authority, the usual route is a Court of Protection deputyship application — costing £432 in application fees (post-July 2026), plus a £100 new deputy assessment fee, potentially a £266 hearing fee, and ongoing annual supervision fees of £320.
If multiple siblings want to be deputy: The Court will consider which applicant is best placed to act in the parent's interests. Contested deputyship applications are expensive and slow — professional clinical fees for the COP3 capacity assessment alone run £300 to £500, and contested hearings can take six months or more.
The Three Most Common Disputes and How English Law Handles Them
Should we sell the family home to pay for care? Under the Care Act 2014 financial assessment, the property is included in the means test only if no qualifying person still lives there. A spouse, a partner, a dependent child under 18, a relative aged 60 or over, or a disabled relative living in the home triggers a mandatory property disregard. If the home must be included and non-property capital is below £23,250, the 12-week property disregard gives families breathing room after a permanent care home admission — during this period the council ignores the property's value. After that, a Deferred Payment Agreement lets the parent borrow against the home equity rather than forcing an immediate sale.
Who decides which care home? If an LPA for Health and Welfare exists, the attorney makes this call — but they must act in the parent's best interests, not their own convenience. If siblings disagree about a placement, any family member can apply to the Court of Protection for a specific welfare decision. Before going to court, consider mediation through a specialist elder care mediator — it is faster, cheaper, and keeps the decision within the family.
Is someone mismanaging the parent's money? If you suspect an attorney or deputy is misusing funds, report it to the Office of the Public Guardian (OPG). The OPG has statutory powers to investigate, require accounts, and apply to the Court of Protection to revoke the appointment. If the situation involves criminal theft or fraud, contact the police and the local authority's adult safeguarding team — the council must make or arrange a Section 42 enquiry when it has reasonable cause to suspect that an adult with care and support needs is experiencing, or is at risk of, abuse or neglect and is unable to protect themselves as a result of those needs.
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Practical Steps to Reduce Conflict
Hold a structured family meeting. Set an agenda, assign a facilitator (not the primary carer), and circulate key facts in advance: the parent's diagnosis, their current care costs, their capital position relative to the £23,250 upper capital limit, and which legal documents exist. Decisions made with shared information are harder to challenge later.
Document everything. Keep a written record of care decisions, spending from the parent's accounts, and communications with the local authority and NHS. If you are the attorney, you have a legal duty to keep accounts — and transparency is the single best defence against sibling accusations.
Use the Care Act assessment process. Request a Care Act needs assessment from the local authority. The council's independent evaluation of your parent's eligible needs carries statutory weight and gives you a professional, arm's-length basis for care decisions that no sibling can dismiss as personal preference.
Navigating these decisions under pressure is exactly what our Dementia Care in England guide is built for — it includes the template letters for requesting assessments, the step-by-step LPA and deputyship application walkthroughs, and the Care Act dispute resolution pathway.
Get Your Free England — Dementia Support Checklist
Download the England — Dementia Support Checklist — a printable guide with checklists, scripts, and action plans you can start using today.