I don't have any kids (I'm almost a kid myself), but if I did, here is the advice I would write in reverse on their foreheads to remind them of every time they looked in the mirror:
Don't fuck up. Don't be an asshole. Most of the players around you are enemies and allies alike. Stay healthy for awhile. You will get your revenge in the next life, or maybe you won't.
Most likely the social services would come and take them away after that, so their non-existence may be a good thing.