All right!
If Mary Anne and her family are among the few survivors, I think we can count on a visible uptick in the overall average quality of the future human race.
Robert Heinlein would heartily approve.
One key is stocking up on things that take major industry to make. As Heinlein said, you cannot, unless you are Superman, make a steel axe by hand.
One more hint: Once established in a safe (defendable!) place, raid any liquor stores you can find (here in California, all our grocery stores carry liquor). We are talking some serious trade goods until you get a corn crop growing.