When parents are diagnosed with dementia or show its early symptoms, the issue children most often face is how to protect their parents' assets. There are many cases where sudden wills are written in the name of parents with weakened cognitive ability, or unbalanced gifts are made to specific children, triggering full-fledged inheritance disputes. This article summarizes what the adult guardianship system is as the strongest preemptive measure in such situations, when and how to apply, and how it operates when there is conflict between family members.
Dispute Patterns Most Frequently Occurring in Early Dementia
The patterns I often see in the consulting room are as follows.
- When parents' cognitive ability weakens, one child lives with the parents and takes over asset management.
- During that period, real estate in the parents' name is gifted to that child, or a new notarized will is drafted.
- Other children become aware of this belatedly and begin to dispute whether the parents had sufficient cognitive ability to make that decision.
- By that time, asset transfers have already been completed, making recovery very difficult.
When parents enter the early stage of dementia, cognitive ability and memory weaken, and disputes arise over the legal effect of expressions of intent made at that time. It is very difficult to subsequently prove whether a child coerced the parents into wills or gifts, or whether the parents fully understood the meaning.
The Adult Guardianship System in One Line
The adult guardianship system is a system where, for individuals whose cognitive ability has weakened, the court appoints a guardian to protect the individual's assets and personal affairs. The biggest feature is that the guardian cannot freely dispose of the individual's assets, and important disposal acts require permission from the family court.
The types of guardianship are divided by capacity level as follows.
| Type | Target | Core Effect |
|---|---|---|
| Adult guardianship | Person continuously lacking the ability to handle affairs due to mental constraints | Broad guardianship (scope set by court) |
| Limited guardianship | Person whose ability to handle affairs is insufficient due to mental constraints | Guardianship limited to certain matters |
| Specific guardianship | Person needing help for temporary or specific affairs | Limited to specific affairs |
| Voluntary guardianship | When the person has concluded a guardianship contract in advance | Guardianship by contract |
In the early stage of dementia, limited guardianship or adult guardianship is often reviewed, and which is appropriate depends on medical diagnosis and court judgment.
Why Adult Guardianship Is Powerful for Preventing Inheritance Disputes
Once an adult guardianship is appointed, the individual's asset disposal acts come into a structure where they require the guardian's consent or court permission to take effect. Within this structure, the following scenarios are virtually blocked.
- Unbalanced gifts to specific children
- Drafting of new notarized wills (virtually impossible without court permission)
- Arbitrary disposal of real estate
- Transfers of large-scale financial assets
The guardian cannot freely move the individual's assets. The court manages the guardian, or requires court permission for disposal acts above a certain scale. There is virtually no possibility that the court will grant permission for a gift act favoring only one heir, and new will drafting is only permitted exceptionally when the content is balanced.
If you feel that your parent's condition has been even slightly compromised, the key to dispute prevention is to start the adult guardianship procedure quickly, separately from whether you yourself become the guardian.
Who Will Become the Guardian, Another Beginning of Dispute
When an adult guardianship application is filed, there are many cases where another dispute breaks out between siblings over who will become the guardian. When children are not on good terms over their parents' assets, who becomes the guardian appears as the question of who holds asset management authority.
The point I would like to emphasize here is that the guardian cannot freely move the individual's assets. The guardian, under the court's management, plays the role of caring for the individual's assets and personal affairs. Therefore, whether you yourself become the guardian or another sibling becomes the guardian, an immediate unfavorable or favorable outcome for one side does not arise.
Rather, in cases where sibling relationships are poor and agreement is difficult, there are quite a few cases where the family court appoints a third-party (attorney, social worker, etc.) as a professional guardian on its own initiative. When a professional guardian outside the family is appointed, neutral management is conducted without favoring either sibling.
The Timing of Application: The Later It Is, the Less Effective
The two biggest reasons for hesitating to file for adult guardianship are as follows.
- The emotional burden that parents might feel hurt if they hear about it
- The judgment that the situation has not yet reached that point
Both are circumstances that can be sufficiently understood, but as the application timing is delayed, the following risks also grow.
- The possibility that new wills or gifts were made when cognitive ability had already weakened
- The burden of subsequently proving capacity at that time
- The reality that recovery after asset transfers are completed is very difficult
The regret I often hear in the consulting room is "I should have applied for guardianship a little earlier." At the time signs of cognitive decline appear, I recommend reviewing the possibility of guardianship procedures along with a medical diagnosis at least once.
Application Procedure, How Is It Conducted?
Adult guardianship applications proceed in the following order.
- Petition for commencement of adult guardianship to the family court
- Submission of medical materials such as physician's diagnosis
- Confirmation of the individual's intent (when possible)
- Qualification review of guardian candidates
- Court's adjudication of commencement of guardianship and appointment of guardian
Once the adjudication is finalized, the guardian manages the individual's assets and personal affairs within the determined scope, and court permission is required for disposal acts above a certain scale. The guardian bears the obligation to regularly report the status of asset management to the family court.
Supplementary Measures Outside Guardianship Applications
If adult guardianship is difficult or burdensome, the following supplementary measures can also be reviewed.
- Voluntary guardianship contract: A method of concluding a guardianship contract in advance while the individual has capacity. This is the form that best reflects the individual's intent.
- Will substitute trust: A method of determining asset management and post-mortem distribution methods with a trust institution while the individual is alive. The post-mortem flow of assets can also be designed in detail.
- Notarized will: If a notarized will is obtained at a time when the individual's intent is clear, the possibility of post-mortem will disputes is significantly reduced.
- Preparation of advance medical materials: If regular check-up results and cognitive evaluation materials are shared by the family, the burden of proof in the post-mortem dispute stage is greatly reduced.
No single method is the correct answer. It is common to combine multiple methods depending on the parents' condition, family structure, and asset scale.
Frequently Received Questions
Q. Our parent wants to give all assets to one child of their own will. Can other children stop this? A. If it is a decision made with sufficient capacity by the parent, it is difficult for other children to immediately stop the decision itself. However, if there is doubt about the parent's cognitive ability, an evaluation of capacity may be conducted along with the adult guardianship application. Prompt review is needed.
Q. Siblings cannot agree on who should be the guardian. What should we do? A. There are quite a few cases where the family court appoints a third party (attorney, social worker, etc.) as a professional guardian on its own initiative. In cases where sibling agreement is difficult, actively reviewing the appointment of a professional guardian is effective for preventing disputes.
Q. Once adult guardianship begins, can the decision be reversed? A. If there are circumstances such as the individual's condition recovering so that guardianship is no longer needed, termination of guardianship can be requested. However, since adult guardianship is typically conducted in cases where cognitive ability recovery is difficult, it is good to also review at the case stage whether other forms such as limited or specific guardianship are more appropriate.
Closing
The time when signs of your parent entering the early stage of dementia appear is the best time to review the adult guardianship procedure. Adult guardianship is not a system where the guardian can freely move the individual's assets, but a system that protects the individual's assets and personal affairs under court management. In cases where sibling relationships are poor, the family court may appoint a professional guardian. Since the dispute prevention effect decreases as the application timing is delayed, I recommend having a check at the time signs of cognitive decline appear.
Written by: Attorney Noh Jongeon, Jonjae Law Firm. Reviewed by: Attorney Yoon Jisang. Last reviewed 2026-05-30
This article is for general legal information purposes and does not guarantee the outcome of individual cases. The type and application timing of adult guardianship may vary depending on the individual's condition and family structure, so please consult an attorney separately for specific cases.
