When you have kids and you remarry, you hope that eventually your children and your new spouse will someday share the kind of loving bond you already have with your kids. You know that it will take time and hard work, but still, you hope.
Maybe you don’t specifically hope that after 8+ years your oldest will leave this:
… and then your spouse will behold that note, flip it over, and do this:
… but when it happens, you’ll still feel a sense of warm fuzziness in-between giggles.