It is very common to let the first line end with a place name, in this case for instance the name of the town where your son goes to school (hope it isn't Llanfairpwllgwyngyllgogerychwyrndrobwllllanty
siliogogogoch)...
But it needn't be a town name, it could also be some other kind of place designation, like for instance "There once was a teacher up north", "There once was a teacher at school", "There once was a teacher in Kent" - and so on.