Yes but sometimes their kids just talk forever, or they themselves just ignore the reality that their time has come, and we've got places to be. So the nice request comes with a deadline.
What niceness level exactly?
The most nice I can be in my system is -20.. but being too nice to one process leaves others with less time and resources in their life.
Some advice for process parents. Don't be that kinda process that zombifies your children instead of letting them go, it's very annoying and unhealthy.