Diane*, 59, loves her son Marcus*, 33, without reservation. She always has. So when Marcus calls at noon on a Tuesday in a crisis, rent is short again, his girlfriend just left, or he needs to talk, Diane sets down whatever she is doing and picks up. She always picks up.
She has paid portions of his rent more times than she can count. She has absorbed his anger when he doesn’t get what he needs. She has lost sleep over his problems while he, somehow, seems to sleep fine. And lately, she has begun to wonder how she ended up here: exhausted, resentful, and afraid that if she ever actually says no, she will lose him entirely.
The painful irony is that the very thing Diane believes is holding their relationship together may be the thing quietly pulling it apart.
What boundaries actually are, and what they are not.
The word “boundary” is one of the most used and most misunderstood terms in modern psychology. For many parents, it carries a cold, clinical connotation. It sounds like distance, rejection, the very opposite of love.
It isn’t any of those things.
A boundary is simply a definition of what you will and will not do based on your own values, your emotional capacity, and what you know to be true about yourself. A boundary is not about controlling your adult child’s behavior. It is about defining your own. You cannot set a boundary that requires your child to change. You can only set a boundary that changes what you do.
This distinction matters enormously in practice. “You need to stop calling me so much” is not a boundary. It is a request, and one your adult child can ignore. “I’m available by phone between six and eight on weeknights” is a boundary. It defines your behavior, and you can actually hold it.
There is also an important difference between a boundary and a wall. A boundary is permeable and relational. It keeps the connection intact while defining its shape. A wall is a shutdown. It is a complete emotional or physical withdrawal that offers protection at the cost of the relationship itself. When they finally reach their limit, many parents skip the boundary entirely and go straight to the wall. They stop answering. They go cold. They shut down. It feels like relief, but it is a trauma response, not a relational strategy.
Diane has done both. She has spent years with no boundary at all, and on two occasions she has swung to a wall, not speaking to Marcus for weeks after a particularly painful blow up. Neither extreme has made things better. The relationship keeps resetting to the same uncomfortable baseline.
Why this feels so hard.
Understanding what a boundary is doesn’t automatically make it easier to set one, especially with your own child.
Part of what makes this so difficult is a dynamic clinicians call enmeshment, a term first developed by family therapist Salvador Minuchin to describe what happens when the emotional boundary between two people becomes so blurred that one person’s distress automatically becomes the other’s crisis. In plain terms: when Marcus is upset, Diane is upset. When Marcus is in financial trouble, Diane feels personally responsible for solving it. When Marcus is angry, Diane feels as though she has failed. His emotional world and hers have become so intertwined that she can no longer clearly locate where he ends and she begins.
Enmeshment is not a character flaw. It often develops gradually and with the best of intentions. For Diane it grew out of years of being the steady, dependable parent through Marcus’s turbulent twenties. She filled every gap. She caught every fall. It felt like love, and it was love. But over time it also became a pattern that left Marcus with little reason to develop his own emotional resources and left Diane with fewer and fewer of her own.
This connects directly to what Bowen Family Systems Theory describes as differentiation, the capacity to remain emotionally grounded in your own sense of self while staying connected to someone whose distress might otherwise pull you off center. Think of it as the ability to care deeply about another person without being emotionally controlled by their feelings. Parents with lower differentiation, as Diane’s therapist would later help her understand, experience their adult child’s emotions almost as their own, making it nearly impossible to hold a limit without it feeling like abandonment.
Then there is the guilt. Every time Diane considers saying no, Marcus’s anticipated reaction plays in her mind before she has even spoken. She hears the disappointment in his voice. She imagines him struggling alone. And she picks up the phone.
The two ends of the spectrum, and why both cause harm.
Most parents who struggle with boundaries with their adult children fall somewhere on a spectrum between two painful extremes.
On one end is the parent who has no boundaries at all. They are over-functioning, rescuing, absorbing, and enabling. Enabling is a clinical term for what happens when our support removes the natural consequences that would otherwise motivate change. Diane paying Marcus’s rent doesn’t just help him, it also removes the discomfort that might otherwise prompt him to look at his spending habits differently. It solves the immediate problem while preserving the underlying pattern.
The clinical reality of over-functioning is that when one person in a relationship consistently does more than their share, the other person consistently does less. It is not a moral failing, it is a relational dynamic, and it is self-sustaining. The more Diane over-functions, the less Marcus is required to develop his own capacity. And the less Marcus develops, the more Diane feels she has to do. The cycle feeds itself.
On the other end of the spectrum is the parent who has built walls instead of boundaries. This parent finds that they have become so depleted and so defended that genuine emotional access to the relationship is closed off entirely. This often follows a period of extreme over-functioning. The parent finally snaps, withdraws completely, and the adult child, who has never learned a different relational pattern, experiences the withdrawal as abandonment rather than a limit. Neither person has the tools for what comes next.
Both extremes confirm the adult child’s deepest, most unspoken fear: that the relationship is fundamentally unstable.
What boundaries look like in practice.
A boundary is not a speech. It is a behavior, and it is only as real as your willingness to maintain it when it is tested.
The language of a boundary matters, but the follow-through matters more. Here is the practical difference.
Instead of “I can’t keep bailing you out,” which invites negotiation and signals ambivalence, try “I love you, and I’m not able to lend money anymore.” Full stop. No lengthy explanation. No list of reasons. The shorter and calmer the boundary, the more clearly it communicates that you mean it.
Instead of “You call too much and it’s overwhelming,” which puts the focus on Marcus’s behavior, try “I’m available to talk in the evenings. If I miss a call, I’ll get back to you then.” This defines what Diane will do, and it holds regardless of how Marcus responds.
What almost always happens next is important to understand. The adult child escalates. When a parent who has never held a limit suddenly holds one, the adult child’s first response is typically to push harder. That can look like more calls, more pressure, and more emotional intensity in an effort to get the relationship back to its familiar shape. This is not manipulation, necessarily. It is a predictable response to change in a system that has been stable, however unhealthily, for a long time.
The boundary is only a boundary if it holds through the escalation.
Diane stopped answering Marcus’s midday calls. He called more. She held. She answered in the evenings, warmly, and did not reference the missed calls. Within a few weeks, something quietly shifted. Marcus began calling less, and when he called, the conversations were different.
Boundaries as the bridge.
Here is what Diane did not expect: when she stopped being endlessly available, Marcus started treating her differently.
Not immediately. Not smoothly. But over time, as Diane stopped absorbing every crisis and solving every problem, Marcus was forced to develop capacities he had been outsourcing to her for years. And as Diane stopped over-functioning, she stopped resenting. She had more of herself to bring to the relationship, and Marcus, for perhaps the first time, began to experience his mother as a real person with her own interior life rather than a resource to be accessed.
That is what a boundary actually does. It doesn’t create distance. It creates the conditions for genuine connection. Children of all ages, including adult children, feel more secure with a parent who has a clear, grounded sense of self than with one who is endlessly accommodating. The limit, paradoxically, is what makes the relationship feel safe.
A boundary is not the end of closeness. It is the beginning of the kind of closeness that can actually last.
If you are a parent who recognizes yourself in Diane’s story, exhausted, resentful, or unsure where your child ends and you begin, I’d be glad to help you find your footing. Reach out directly to me at (702) 575-4723 for an Introductory Call.
*Diane and Marcus are fictional composite characters created for illustrative purposes. They do not represent any specific individual or client. This post is for informational and educational purposes only and does not constitute legal or clinical advice.
