I have two (DS 6 and DD 2.5), the early days my oldest was mostly uninterested in the baby but in the past year or so their relationship has just flourished. They love to play together, are mostly kind and caring. They are of course 2 and 6, so have quarrels over who gets the biggest chip, etc, but they genuinely seem to enjoy each others company and can play for hours together and rarely pester each other, tease, or otherwise be mean.
Is This normal for sibling relationships? I know things can change over time but is it likely to continue this way? It makes me quite happy but I want to brace myself for reality, too.