Personally one thing I would not want to do is treat the inside on a confined space with poison chemicals and then sit in there even if it has "aired out" - especially with a kid.
Don't know if you even saw the guy on TV pushing 1,001 natural remedies for bugs but one thing he swears drives flying insects away is basil. Said to hang it in cheesecloth. Might want to research this a little more but I don't think basil is very harmful to humans.
Sliced cucumbers
One of the more unusual wasp repellents is cucumber. This vegetable has an acid property that wasps don't like. Cut up a few slices and leave around your picnic or BBQ area. They stay away and you can enjoy your outdoor activities without fear of getting stung.
Hang a crumpled brown paper bag
A third natural wasp repellent to use is by preying on the fact that wasps are territorial so they will not make a nest where one already exists. To give the illusion of a wasp nest, crumple up a small brown grocery bag, attach a string, and hang near your doors. They cannot tell if it's truly a nest, but they seem to
trust what they see. Their instincts will kick in and they will go away.
A couple other things I found:
Sliced cucumbers. One of the more unusual wasp repellents is cucumber. This vegetable has an acid property that wasps don't like. Cut up a few slices and leave around your picnic or BBQ area. They stay away and you can enjoy your outdoor activities without fear of getting stung.
Hang a crumpled brown paper bag. A third natural wasp repellent to use is by preying on the fact that wasps are territorial so they will not make a nest where one already exists. To give the illusion of a wasp nest, crumple up a small brown grocery bag, attach a string, and hang near your doors. They cannot tell if it's truly a nest, but they seem to
trust what they see. Their instincts will kick in and they will go away.
(Maybe a combination of a few of these?)
Another thing that might warrant some consideration are natural predators. How about putting a few praying mantis' in there?