I'd mention to him nicely that you are not comfortable babysitting his child while you are trying to get your work done. If he gives you any flack, ask him,"if I were a man, would you be expecting me to babysit your child?" Not in a confrontational way, just kind of put the seed in place that you are thinking this is a gender thing. I have found that even the most obnoxious of bosses gets nervous when he thinks he may have crossed the gender line.
Sparrow
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Sparrow
___________________
www.scifichics.com