Sibling Relationships

You didn't choose your sibling. You can still choose how you relate to them.

Decades of shared history don't automatically produce an adult relationship that fits who you are now. This is space to work out what needs to shift, and what's genuinely yours to carry.

Sibling relationships carry a peculiar weight. Unlike almost every other relationship in your life, you didn't choose it, can't easily walk away from it, and it comes pre-loaded with decades of shared history that nobody updated as you both grew up. The responsible one, the difficult one, the peacekeeper, the golden child: those roles were assigned young, often without discussion, and they have a way of reasserting themselves the moment you're back in the same room.

You might genuinely love your sibling and still find every interaction with them draining. Both things are frequently true at once, which makes the whole subject hard to talk about honestly, since most conversations about family expect a tidier verdict than "it's complicated and always has been."

Old comparisons tend to resurface at exactly the moments that matter most: caring for ageing parents, splitting inheritance, planning a family event. Suddenly you're not two adults negotiating logistics, you're the roles you were assigned at eight years old, negotiating the same thing all over again.

You're allowed to want a different relationship with your sibling than the one the family script handed you. We get it, and we know how to help you work out what would actually need to shift.

What it is

This covers ongoing difficulty, distance, rivalry, or conflict in adult sibling relationships, often rooted in childhood roles, comparison, or unresolved history that continues to shape how you relate now, particularly around shared responsibilities like caring for ageing parents or navigating family events.

Sibling relationships are among the longest-running relationships most people have, which is exactly why old patterns can be so persistent, and exactly why they're genuinely workable once you understand where they came from. This isn't about assigning blame to a sibling who isn't in the room. It's about understanding your own role in the dynamic and what you're able to change.

Causes & risk factors

Adult sibling difficulty commonly traces back to fixed childhood roles that were never revisited or renegotiated as everyone grew up, so the "responsible one" or the "difficult one" simply continues by default. Perceived favouritism or comparison from parents, whether accurate or not, often leaves a lasting mark on how siblings relate to one another and to themselves.

Unequal distribution of caregiving or family responsibility, particularly around ageing parents, is a frequent flashpoint in adulthood, as are long periods of distance where underlying tension was never actually addressed, just left to sit.

What this means in practice: this pattern isn't a reflection of how much you care about each other. It's usually a set of old roles and unresolved history that's genuinely possible to update.

How this shows up

• Falling back into old roles, like the responsible one or the difficult one, almost instantly

• Rivalry or comparison that persists well into adulthood, sometimes unconsciously

• Resentment over unequal caregiving or family responsibility

• Difficulty maintaining the relationship as genuine equals, rather than old hierarchies

• Avoiding contact altogether to sidestep dynamics that feel too tiring to navigate

• Tension that spikes predictably around parents, inheritance, or family events

Our treatment approach

We work 1:1 with a BACP-registered therapist to help you understand the roles you and your sibling fell into and what would need to shift for the relationship to feel more equal and current. Our ACT-informed approach supports you in engaging, or stepping back, based on your own values rather than old obligation or guilt.

Why ACT for this

• It separates old family roles from who you actually are and want to be now

• It supports values-led choices about closeness or distance, rather than default guilt-driven ones

• It builds tolerance for the discomfort of doing things differently within an established family system

What this looks like in sessions

• Mapping the roles you and your sibling were assigned growing up

• Identifying where those roles still play out in adult interactions

• Working through resentment around caregiving or family responsibility

• Practising a different way of engaging, or consciously stepping back

• Support navigating specific flashpoints, ageing parents, inheritance, family events

"Most sibling tension isn't really about the argument in front of you. It's two adults still running an old script neither of them wrote as adults." — Clinical Lead, Eunoia Health”

What to expect: your first six weeks

• Week 0 — Initial call to understand the sibling relationship and what's currently at stake.

• Week 1-2 — Mapping the childhood roles and how they still show up now.

• Week 3-4 — Working through specific resentments, particularly around caregiving or family fairness.

• Week 5-6 — Practising a different way of engaging, or deciding what distance looks like.

• Ongoing — Continued sessions supporting whatever direction you choose to take.

• Review point — A check-in on how the relationship, or your relationship to it, has shifted.

If a sibling relationship is on your mind, a free 15-minute call is a good place to start unpacking it.