>>They don't get large enough to be a threat to children at all.
They sure can. I have a couple large adult BPs that could easily kill a small child.
>>Although they can be fairly heavy snakes when mature, they >>only average about 4' in length. Sometimes females can be a >>little longer.
I'm not sure what the average is, but a 4'+ BP is still a strong snake. And bits can be severe to a small child. Although, the BP is known for being a fairly gentle snake. I only have a couple of mean ones.
>>The only thing I would be concered with is making sure the >>children wash their hands well if they handle the snake. Like >>all reptiles, there is the slight risk of salmonella.
And make sure you wash your chicken. 
>>If I'm wrong on any of this, I'm sure the gentle people of this forum will correct me!
Gentle?? No way! I'm gonna beat you with a wet noodle. 
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Jay A. Martin