Why Two Siblings Can Remember the Same Childhood So Differently Siblings often remember the same childhood in completely different ways, and that’s not a flaw in anyone’s memory. Every time you genuinely recall something, not just describe it, the memory goes soft and editable for a few hours. Whether it actually changes depends on what happens while it’s open, which is why two siblings can sit in the same place on the same day and each walk away with a different memory of it.