Can my casual employees sue me for lack of contract

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Dear Cathy,

Question: I am a make-up artist working in Nairobi. My business has grown to the extent that I have to train and hire assistants, especially during the weekends and holidays when demand for my services is very high. At the moment, I have retained five assistants who I have been training. We do not have a formal contract and we operate on trust. The nature of my business is such that when it is low, I do not need their services. What structure can I use to engage them without exposing myself to employment lawsuits? -Wanjiku

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