Parental Infidelity and the Shared Risk of Dysfunctional Triads, Enmeshment and Boundary Confusion

The Seamless Blend
Apr 28
4 min read

Updated: Jun 9

Throughout this series, we have explored two seemingly opposite responses that can emerge when parents are navigating infidelity.

On one end of the spectrum, some parents unintentionally blur boundaries with children, sharing too much information, leaning on children for emotional support, or drawing them closer into the emotional reality of the betrayal. On the other, some parents attempt to protect children by keeping them completely outside the experience, avoiding conversations altogether and maintaining rigid boundaries around what is happening within the family.

While these approaches appear very different, family systems research suggests they often lead to remarkably similar outcomes.

Both can leave children struggling to understand what they are experiencing, where they fit within the family, and what is expected of them during a period of significant disruption.

Although these responses sit at opposite ends of a spectrum—too much involvement or no involvement at all—they often lead to similar outcomes.

Both increase the likelihood of risks to healthy, thriving development and can impact the quality of parent–child relationships well into adulthood.

Dysfunctional Triads (Triangulation)

A dysfunctional triad occurs when a child becomes drawn into the emotional or relational space between parents.

This may happen overtly, where a child is asked to take sides, carry messages, or provide emotional support. More commonly, it occurs subtly through emotional alignment, loyalty conflicts, or unspoken pressure to support one parent over another.

Negash and Morgan (2016) identified a common risk following parental infidelity. Shared emotions of anger, sadness, disappointment, fear, or mistrust toward the unfaithful parent can create a powerful emotional connection between the betrayed parent and child. While this often begins as a natural response to a painful family disruption, over time it can shift from healthy empathy into an unhealthy alliance.

As a parent and child become increasingly connected through a shared emotional experience, the foundations for a dysfunctional triad can begin to emerge.

Alternatively, children can begin to feel responsible for managing tensions that belong within the adult relationship, placing them in a role they were never intended to hold.

Boundary Confusion

Boundary confusion develops when the distinctions between parent and child roles become unclear.

Children may become uncertain about what responsibility belongs to them, what belongs to their parents, and where they fit within the changing family dynamic. This can be particularly difficult following infidelity, where emotions are heightened and family routines, priorities, and relationships may be shifting simultaneously.

Emotional Insecurity

Children thrive when they experience predictability, stability, and emotional safety.

When family boundaries become unclear or when children are left to navigate uncertainty on their own, their sense of security can be disrupted.

This may present as challenging behaviours or even delinquency, anxiety, heightened vigilance, emotional withdrawal, or difficulty trusting that important relationships remain safe and reliable.

Enmeshment

Enmeshment occurs when emotional boundaries between parent and child become overly intertwined.

In the context of parental infidelity, dysfunctional triads can create the conditions for enmeshment to develop. Shared pain, loyalty conflicts, emotional alignment, and increasing emotional dependence can gradually replace healthy parent–child boundaries, drawing children further into adult emotional and relational dynamics. What may begin as empathy, support, or a desire for closeness can slowly evolve into an unhealthy emotional alliance.

Typically, rather than being supported within their own developmental needs, children begin carrying, absorbing, or responding to the emotional experience of a parent. This often develops gradually and unintentionally through a genuine desire for closeness, connection, or support during an extraordinarily difficult period.

It is problematic because children can carry these relational patterns into adulthood. Having learned that closeness involves emotional responsibility, blurred boundaries, or loyalty conflicts, they may be more vulnerable to insecure attachment patterns, difficulties establishing healthy boundaries, and challenges within their own intimate relationships.

In one scenario, the child becomes too close to the pain.

In the other, they become too alone with it.

Despite appearing very different on the surface, both experiences can leave children feeling emotionally unsafe, confused, and unsupported in making sense of what is happening around them.

Neither position supports what children need most:

clear boundaries
emotional safety
guided understanding

The Evidence-Informed Therapeutic Middle Ground

The encouraging news is that research does not suggest parents must choose between openness and protection. The work is not choosing between telling children everything or telling them nothing. It is finding the middle ground.

A child-focused approach recognises that children often know more than adults realise, while also acknowledging that children should never be burdened with information or emotional responsibilities that belong to adults.

This means:

maintaining clear parent–child boundaries
keeping adult content with adults
offering children enough clarity to feel safe, secure, and held

In practice, this includes helping children understand, in an age-appropriate way, that:

they are loved by both parents
their relationship with each parent remains secure
even if aspects of the adult relationship change, their place in the family does not

This is where children remain children—not confidants, not emotional supports, not outsiders—but supported, informed, and protected within a stable relational structure.

This therapeutic middle ground is where both research and practice consistently point. Not silence. Not overexposure. But thoughtful, child-focused communication combined with clear, healthy family boundaries.

Throughout this series, we have explored two seemingly opposite responses that can emerge when parents are navigating infidelity.

While these approaches appear very different, family systems research suggests they often lead to remarkably similar outcomes.

Both can leave children struggling to understand what they are experiencing, where they fit within the family, and what is expected of them during a period of significant disruption.

Although these responses sit at opposite ends of a spectrum—too much involvement or no involvement at all—they often lead to similar outcomes.

Both increase the likelihood of risks to healthy, thriving development and can impact the quality of parent–child relationships well into adulthood.

Dysfunctional Triads (Triangulation)

A dysfunctional triad occurs when a child becomes drawn into the emotional or relational space between parents.

This may happen overtly, where a child is asked to take sides, carry messages, or provide emotional support. More commonly, it occurs subtly through emotional alignment, loyalty conflicts, or unspoken pressure to support one parent over another.

As a parent and child become increasingly connected through a shared emotional experience, the foundations for a dysfunctional triad can begin to emerge.

Alternatively, children can begin to feel responsible for managing tensions that belong within the adult relationship, placing them in a role they were never intended to hold.

Boundary Confusion

Boundary confusion develops when the distinctions between parent and child roles become unclear.

Emotional Insecurity

Children thrive when they experience predictability, stability, and emotional safety.

When family boundaries become unclear or when children are left to navigate uncertainty on their own, their sense of security can be disrupted.

This may present as challenging behaviours or even delinquency, anxiety, heightened vigilance, emotional withdrawal, or difficulty trusting that important relationships remain safe and reliable.

Enmeshment

Enmeshment occurs when emotional boundaries between parent and child become overly intertwined.

In one scenario, the child becomes too close to the pain.

In the other, they become too alone with it.

Despite appearing very different on the surface, both experiences can leave children feeling emotionally unsafe, confused, and unsupported in making sense of what is happening around them.

Neither position supports what children need most:

clear boundaries

emotional safety

guided understanding

The Evidence-Informed Therapeutic Middle Ground

The encouraging news is that research does not suggest parents must choose between openness and protection. The work is not choosing between telling children everything or telling them nothing. It is finding the middle ground.

A child-focused approach recognises that children often know more than adults realise, while also acknowledging that children should never be burdened with information or emotional responsibilities that belong to adults.

This means:

maintaining clear parent–child boundaries

keeping adult content with adults

offering children enough clarity to feel safe, secure, and held

In practice, this includes helping children understand, in an age-appropriate way, that:

they are loved by both parents

their relationship with each parent remains secure

even if aspects of the adult relationship change, their place in the family does not

This is where children remain children—not confidants, not emotional supports, not outsiders—but supported, informed, and protected within a stable relational structure.

This therapeutic middle ground is where both research and practice consistently point. Not silence. Not overexposure. But thoughtful, child-focused communication combined with clear, healthy family boundaries.