Taking each in turn:
-likelihood of illness: in kids??? they are sick all the time. In others? they have the chance already to be protected from severe illness and illness is part of the human condition
-long term health damage: in them? long COVID is rare in kids and in any case one of them has had it. Since they are both boys, there is a small if real risk of myocarditis so for them the risk/benefit ratio is pretty much a wash. In others? they've had the chance already to be protected through vaccination.
-death: in them? Fewer than 1000 kids have died of COVID and almost all of them had significant health problems. In others, deaths among the vaccinated are on the floor.
My kids were "sick all the time" as well (I used to dread the "back-to-school flu" we all got every year in September), but they got fewer serious diseases than I did as a kid because vaccines against those diseases had been developed over that time.