Although Black Widows are poisonous I wouldn't really worry about them all that much Paul.
The main thing is keep a clean house. Those 10% of the houses where they hang out in the closets are just never swept or anything.
And I can't picture your daughter ever going in the crawl spaces unless there's an emergency.
Most people that live around here forget about them even existing and live a normal life never getting bitten
Your again a lucky man to have a snake that you never have to see in your place David
Although I wouldn't go for a swim with the water snakes there
I haven't swam in the river here since I saw a snake in it, although I still go swimming in the Okanagan Lake