Dave, make sure these children are allowed near the snake. If the decision was made by the baby sitter, her, as well as you can be in serious trouble for this! espeacially when dealing with handicapped children. personally I feel its a great oprotunity to educate children on these cool animals, however parents always need to know!
my advice, is to handle the snake.. Then show them how to do the same. Balls are pretty placid. Hope it all goes well.