@ Basil
The regular 'sacking" of your child won't work for very long. If the purpose of a procedure is purely to circumvent a law, the courts will ignore this and look on it as unbroken employment.
Not quite the same, but there have been recent cases in France where companies ( autoroute toll-booths) which just kept on rolling over fixed-term contracts (albeit over four or five years ) were fined for not treating the employees as full-time normal staff as they obviously were.