Welcome to FR.
Know that many people are praying for those in situations like your family.
There’s not a lot most of us can do otherwise.
Per nurse's guidelines for the thread (useful information, not just chatter), everyone in the path of the storm should have a checklist. You can expand on the ones below, of course, but have a baseline of preparation done ASAP:
I cannot emphasize enough the importance of medication for you or your loved ones. If your medications require refrigeration (i.e. insulin), have a cooler set aside for them with plenty of ice. You can freeze zip lock bags that are 2/3 full of water and have them ready if you don't have ice packs.
You should have a weather radio, so when the power goes out you can recieve information and updates.
Go to this webpage, select your state, and write down the frequency for the NOAA updates in your area:
http://www.nws.noaa.gov/nwr/coverage/station_listing.html
DuncanWaring - can you ping the prepper list? I am sure they can add some very good and useful information here. Just ask them that if they post on the thread to include concrete uselful info per thread guidelines on post#1 from nauti nurse.