The simplest and most rewarding pleasure in life when you're a parent is to cuddle your children. The Fingernails decided over dinner that what was really needed before bedtime was a tickling match, so after clearing the kitchen, that's exactly what we had. There were lots of screams and lots of laughter, then the little ones announced they wanted a round of hugs, so we lay there for a few minutes with our arms around one another until Fingernail II said she'd had enough. Fortunately, the Social Services weren't on the prowl, as they might have confiscated our children on the grounds that we were being too affectionate, or some such tosh.
Whatever has happened during the day, just the sight of your own children as you get home heals everything. Nature knew what it was doing.