Give your brother or sister room to have a different relationship with the same family.

Siblings grow up in the same house and not in the same family. Ages differ, circumstances change, parents change, and each child gets a version the others never met. Insisting on a shared account of what it was like asks somebody to disown their own experience so the family story stays tidy.

When a sibling remembers something differently, let both versions stand rather than settling which is correct. Ask what those years were like from where they were sitting, and listen to it as new information rather than a challenge.