Naming multiple children as co-trustees can feel like the fairest choice, but California law makes that choice more consequential than it looks. Under California Probate Code §15620, co-trustees must act unanimously unless the trust document specifically says otherwise. That means every decision, from hiring an accountant to selling a house, generally needs every named co-trustee to agree.
You may want each child to feel equally trusted. You may think sharing the responsibility will make the job easier. Or you may simply want to avoid choosing one child over another. But what feels like the easiest solution during the planning process can create unnecessary complications later, because trust administration requires decisions, communication, organization, and sometimes difficult conversations, and naming siblings to make those decisions together brings existing family dynamics directly into the administration process.
How Well Do They Work Together?
The single most important question to ask before naming co-trustees is whether your children can actually make decisions together, not just whether they get along.
Your children may love each other and still have very different communication styles, financial philosophies, or approaches to decision-making.
One may want to move quickly while another needs more time. One may be detail-oriented while another prefers the bigger picture. One may be comfortable selling property while another feels emotionally attached to it.
Those differences aren’t necessarily a problem in everyday family life, but they can become one the moment both people have equal authority over the same trust.
If your children already struggle to make decisions together, managing significant assets after your death is unlikely to make that easier.
Do They Have Complementary Skills?
Co-trustees can work well together when their strengths genuinely complement each other, not simply because there happen to be multiple children available to serve.
One child may be financially experienced while another is highly organized or especially good at communicating with family members. Their strengths may complement each other in a way that makes the administration process stronger.
But having multiple children doesn’t mean they all need to serve. Think about what the trustee role will actually require: who is comfortable reviewing financial statements? Who keeps good records? Who follows through on deadlines? And who can communicate clearly with attorneys? Accountants, beneficiaries, banks and other professionals?
The goal should be to select the person or people best equipped to perform the role, not simply divide the title equally.
Could It Affect Their Relationship?
Serving as co-trustees during an emotional period can put real pressure on a sibling relationship, even when everyone involved has good intentions.
Your children may already be grieving while simultaneously making decisions about your home, personal belongings, investments, and distributions, and disagreements that would normally feel small can become much bigger when money and family history are both involved.
One sibling may feel like they’re doing most of the work. Another may feel excluded from decisions. Someone may believe assets are being sold too quickly or distributions are taking too long.
Before naming co-trustees, consider whether asking your children to manage the trust together could create conflict that might otherwise never exist.
How Do They Feel About Serving Together?
Ask your children whether they actually want the trustee role before naming them, since trustee appointments are often made without that conversation ever happening.
Do they want to serve?
Are they comfortable serving together?
Does one child already know they’d prefer not to be involved?
You may discover that one child is willing and well-suited for the role while another would be relieved not to have the responsibility.
Having that conversation now can prevent confusion later, when the people involved have far less bandwidth to work through it.
Does the Trust Explain How Disagreements Will Be Resolved?
If you do decide to name multiple trustees, the trust should clearly explain how decisions will be made, because California’s default rule (unanimous action) applies automatically whenever the document is silent. Can decisions be made by majority vote? Does everyone have to agree? Can one trustee handle certain responsibilities independently? Is there a process for resolving a deadlock?
These questions matter because trust administration rarely consists entirely of obvious decisions.
There may be disagreements about selling property, investing assets, paying expenses, making distributions, or hiring professionals.
Without a clear process in the trust document, a relatively routine decision can become stuck simply because the trustees can’t agree, and the fallback is a court petition for instructions under Probate Code §17200, which adds time and expense that a clearer trust document would have avoided.
Could Decisions Become Unnecessarily Delayed?
Every additional co-trustee is another person who has to review information, respond to an email, approve a payment, or sign a document, which means more trustees don’t automatically mean less work for any one of them. Even when co-trustees get along well, having multiple decision-makers slows the administration process down.
If one trustee is traveling, busy with work, difficult to reach, or simply slower to respond, the entire administration process may be affected. That delay can frustrate beneficiaries and create additional work for everyone involved. Sometimes, more trustees just mean more coordination.
Fair Does Not Always Mean Equal Responsibility
Naming one child as trustee doesn’t require treating your children unequally as beneficiaries, since the two roles are entirely separate. One child can serve as trustee while all children remain equal beneficiaries, and another child can be named as successor trustee if the first is unable or unwilling to serve.
Choosing one trustee doesn’t necessarily mean you trust or value that child more. It may simply mean that person is the best fit for the responsibility. In some families, choosing the right trustee clearly during the planning process is far better than leaving multiple children to navigate the role together later, without the benefit of your guidance on why that choice was made.
Common Questions About Naming Co-Trustees
Can co-trustees be removed if they can’t work together?
Yes, but removal generally requires either a provision in the trust document allowing it or a court petition, and neither process is quick. Building a clear decision-making structure into the trust from the start is usually easier than trying to remove a co-trustee later.
Does naming only one child as trustee mean the others inherit less?
No. Being named trustee is a job, not a larger share of the inheritance. All children can remain equal beneficiaries regardless of who is responsible for administering the trust.
Can a professional fiduciary serve instead of, or alongside, a child?
Yes. Some families name a professional fiduciary as sole trustee, as a co-trustee alongside a family member, or as a tie-breaker when family co-trustees can’t agree. This is worth discussing with your tax preparer if family dynamics make any of the concerns above especially relevant.
Choose the Structure Before the Family Has to Figure It Out Later
Naming multiple children as co-trustees may feel like the safest or fairest choice today, but it’s worth thinking beyond the title to what the arrangement will actually require.
How well do your children work together?
Do their skills complement each other?
Could the role affect their relationship?
Do they both want the responsibility?
Does the trust clearly explain how disagreements will be resolved?
Could decisions become delayed because they cannot agree?
Something that seems like the easiest solution now can create unnecessary strife later.
Sometimes choosing one capable trustee, with clear successor provisions in place, creates a simpler and more manageable process for everyone involved.
How Smith Marion Can Help
The structure of a trust affects more than who makes decisions. It also affects how financial activity is tracked, how distributions are documented, and how clearly the administration can be explained to beneficiaries.
At Smith Marion, our Trust and Estate Accounting Services help trustees, executors, attorneys, professional fiduciaries, and families maintain organized financial records throughout the administration process. We can assist with tracking trust income and expenses, reconciling accounts, documenting distributions, organizing financial activity, and preparing fiduciary accountings.
We also provide Court Accounting Services for trusts, estates, conservatorships, and other matters requiring detailed financial reporting in California.
Whether you’re planning ahead or already administering a trust, Smith Marion can help bring clarity, organization, and accountability to the financial side of the process.