Comment by mindslight

It's not that it's "not a big deal", rather the problem is you're up against the limits of details fading to time, negligence, etc. The best case here you're probably looking at each parent blaming the other parent for either doing it or at least letting it happen.

But really my main issue was with characterizing such a thing as a "happy ending". While it's generally good for justice to be served, we should still be wary of people who are a bit too gleeful about punishment.