Introducing kids to reptiles should always come with a healthy dose of good hygiene practices - my nieces and nephews wash their hands aplenty when they visit. With younger children I usually use smaller snakes and, depending on their comfort level, may have them sit on the ground. I'm always close and ready to intervene to save either snake or child.
An example of giving the kid the correct end of a snake - these tails are mostly harmless:
Make it fun, make it positive:
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