In Free Cities, any kid you're not going to keep in your stable of sex-slaves can be sent to one of three orphanages (slave, citizen, and boarding). The end result is the same, their data isn't kept in the save file, and it only takes one button click to send them all. They're still 'alive', they're just not relevant to the game anymore. In Lilith's, you want the same end result, it's FIGHT ALL OF THEM ONE AT A TIME. Alternatively, you could just not contact any of the kids and they would remain in the save file, continuing to bloat, despite not being relevant to the gameplay.
It's pointless makework. And pretending it relates to RL is a disgrace.