Like everyone has said so far, the snakes in and of themselves are not the problem, the parents are. You never leave a child unsupervised with any pet be it snake or spider or bird or cat or dog or horse.

FWIW, I have a 5 y.o. and she has been raised with snakes. She has been "handeling" out oldest ball since she was 3 (with supervision, me holding the head and front end, her "holding" (read "petting" the tail.)

Never let a snake wrap around a childs neck. I would not even allow a less strong snake (rat, king, corn) to drape over a child's shoulders as there would be too much potential for possible problems.