Black Widows and Granddad

We were chatting with Gavin while he ate his Happy Meal.  He was eating as fast as he could so he could resume playing in the play place.  Gavin was interjecting important tidbits into the conversation.  Then we began talking about the playhouse in the backyard.
"We can't play in there because it has a black widow spider in it" comments Gavin.
Shawn responded "We can fix that. When we get home you can show me where you saw it and we'll kill it so you can play in there."
(Gavin has been known to pick up and play with bugs and spiders. So he knows what a Black Widow spider looks like and that they are poisonous.)

Gavin's curiosity is peaked.  "Really?  How do you kill the spider?"
Shawn answers, "Well we could get some spider spray, or I could kill it with a shovel.  We need to see where it is."
"What happens if it bites you?  Do you die?  Or just get really sick?"  Gavin inquires.
"Well" I answer, "It probably wouldn't kill you.  But you'd have to go to the hospital, get an IV and the doctor would have to watch you all night to make sure the medicine works.  It wouldn't be any fun."

Oh," says Gavin thoughtfully.  "I have an idea!  Granddad could come kill it.  That way if he gets bit he can fix his body himself, and no one would need to go to the hospital."

Gavin, always searching for a way to circumvent the problem.