It starts innocently enough. Mom or Dad is slowing down, maybe misplacing a bill or two, so one sibling steps up to help write checks. But the situation can blur quickly. Before you know it, “helping out” transforms into full control, and the rest of the family is left wondering where the money is going.
Navigating the legal boundaries when a child controls a parent’s finances is one of the most difficult aspects of estate litigation. At Ferguson Law Group, we see this dynamic constantly in Silicon Valley and the greater San Jose area. It is not always malicious; sometimes it stems from poor planning, but the legal fallout can tear families apart.
Here is what you need to know about the fine line between helpful management and financial exploitation.
It becomes a legal issue the moment assets meant for the parents’ care are diverted for the child’s benefit or when “convenience” inadvertently turns into ownership.
The most common trap we see involves bank accounts. A parent wants a child to be able to sign checks for groceries, so the bank teller suggests adding the child as a “joint owner.” This is often a massive mistake. Legally, a joint owner has full access to the funds and claims to the title.
We handled a case in Palo Alto involving three siblings that perfectly illustrates this danger. The parents had a house and investment accounts, some in a trust and some outside of it. They unknowingly put one sibling as a co-owner on a major account, while the other two were left off. Legally, that sibling could have kept the entire account for herself after the parents passed, bypassing the trust entirely. While we helped resolve the distribution, the technical title interests created a massive risk that didn’t need to be there.
Authority generally stems from a specific legal document, like a power of attorney (POA) or a trustee appointment, though many children assume authority simply because they are the primary caregiver.
Without a designation like POA or Trustee, a child has no legal standing to dictate how a parent spends their money. However, actual control often happens informally. A child might gain access to online passwords or influence the parent to sign checks. This is where the legal boundaries around a sibling controlling a parent’s finances get murky.
If a power of attorney is in place, that document dictates the scope of the authority. It is rarely a blank check.
You should look for sudden, unexplained changes in estate documents, isolation of the parent from other family members, or withdrawals that don’t match the parent’s lifestyle.
Family members committing financial elder abuse rarely announce their intentions. Instead, they operate in the shadows. Watch for these red flags:
A fiduciary is legally obligated to act solely in the best interest of the principal (the parent), meaning self-dealing or using the parent’s money for personal gain is strictly prohibited.
There is a misconception that a power of attorney is a “license to spend.” It is actually a burden of responsibility. If a child uses POA status to transfer money to themselves, they are likely breaching power of attorney obligations regarding fiduciary duty.
Furthermore, we often hear the defense: “Mom wanted me to have that money.” However, unwritten transfers can trigger tax and legal headaches. For example, large transfers from a parent’s account to a child, and then from that child to a sibling, can be classified as sibling-to-sibling gifts, which carry entirely different tax implications than an inheritance.
California courts scrutinize these cases heavily, looking at the vulnerability of the victim and whether the influencer used their position to secure an unfair advantage.
Undue influence in estate planning often centers on whether the parent acted of their own free will. If a child is misusing parents’ money, the court has the power to intervene. However, proving what happened behind closed doors is complex. This is why we don’t just look at the documents; we look at the timeline of events, the parents’ health at the time, and the equity of the result.
If a violation has occurred, family members can petition the court for an accounting, removal of the bad actor, or specific legal remedies that California statutes provide for financial elder abuse.
Litigation in these matters often requires aggressive action to stop the bleeding. Depending on the severity of the theft or mismanagement, remedies may include:
The strongest protection comes from proper trust funding and avoiding joint tenancy on bank accounts, so authority and asset control are clearly defined.
To reduce the risk of trust abuse and family disputes, California estate planning typically relies on the following safeguards:
When financial decisions start happening behind closed doors or family tensions begin to affect how assets are managed, it is often a sign that legal guidance is needed sooner rather than later. Addressing these issues early can help preserve both the estate and family relationships before damage becomes difficult to unwind.
If you are worried about a parent’s finances, growing conflict between siblings, or questionable activity involving estate assets, Ferguson Law Group provides direct, practical counsel for complex situations. Our team approaches sensitive matters with clarity and resolve, working toward outcomes that protect financial stability and restore control.
Schedule a consultation today to take control of the situation and avoid the cost of waiting.
It crosses the line when control replaces assistance, such as restricting access to accounts, hiding transactions, or using funds for personal benefit without clear authorization or consent.
Only if the parent has granted legal authority through a valid Power of Attorney or trust role. Without formal authority, a child has no legal right to control a parent’s finances.
They should consult an attorney immediately to review authority, secure assets, and assess next steps. In California, suspected elder financial abuse may also warrant reporting to Adult Protective Services.
