The southern black widow is a relative of the infamous red back, well known for biting Australians on the rear at the turn of the 20th century! Widow spider are not commonly found inside a home however any infestation should be treated immediately by a professional pest control specialist due to the danger you and your family could be in. If you find widow spiders in your home you need to find the means in which they are gaining entry. Your attic could be point of entry. Another point of entry could be your doors and windows , in particular, the recesses between the interior and exterior of the windows or doors. This investigating should be carried out by professionals.
Although a bite from a black widow is rarely fatal nowdays but it is not something you want to experience. Should you see black widow spiders more often than usual it may be a good idea to have it checked out.