Studies show that sibling estrangement can be heavily influenced by childhood dynamics, unequal caregiving burdens, inheritance disputes, or personality clashes. In adulthood, these factors frequently lead to a total breakdown in communication.

Estrangement between siblings can develop for various reasons, including:

• Unresolved childhood dynamics – Old rivalries, favoritism, or childhood roles may continue into adulthood, creating resentment. It can be hard to break out of these patterns, making it difficult to be around each other. These old dynamics can show up in adult interactions and we may or may not be aware of them. For example, an older sibling may be surprised when their younger brother breaks off the relationship “just because the older sibling was late a couple times”. In reality the younger sibling was less tolerant with the lateness due to a past trauma of that same older sibling repeatedly leaving them waiting to be picked up from soccer practice for an hour, while the older sibling socialized with friends.

• Different values or lifestyles – Siblings may grow apart due to differing worldviews, political beliefs, or choices in career, relationships, or parenting.

• Family trauma or dysfunction – A history of abuse, neglect, or a toxic family environment can make reconnection difficult or even unsafe. One sibling may choose to distance themselves from this family dysfunction while the other may still be enabling or participating in it.

• Parental influence – Sometimes, parents play a role by intentionally or unintentionally encouraging competition, guilt, or unequal treatment. This drives a wedge between siblings, even as adults.

• Lack of communication – Misunderstandings or built-up grievances may create a distance that seems impossible to bridge. This usually plays a role and is often a part of all the reasons listed here.

• Addiction - One sibling may be struggling with addiction and the other sibling doesn’t want to enable this behavior. Even if the addicted sibling has stopped using, the trust can be difficult to rebuild in their sibling relationships.

The Emotional Toll of Estrangement

Estrangement from a sibling can bring up a mix of complicated emotions. You may feel sad, guilty, angry, and maybe even relief. It may also come with external pressures—other family members may push for reconciliation without fully understanding the pain of the siblings. This can make things even harder.

In many instances, one or both of the siblings are unwilling or unaware of the work needed to be done to heal the relationship. Positive change in the severed relationship is not a guarantee and most  likely will not occur at all unless both (or all) siblings are willing to communicate and try. Sometimes, in fact, it can be the healthier option NOT to communicate or make efforts toward the relationship.

Grieving the loss of a sibling relationship, even if it was dysfunctional, is part of this process. It’s okay to feel conflicted about the distance, and it’s also okay if reconnection isn’t the right choice for you.