First, mega-sympathy about your hurricane-ruined vacation. That stinks.
However, storms--hurricanes, tornadoes, blizzards, etc.--ruin people's Disney/DVC vacation plans pretty regularly (it happened to me w/"Snowmageddon" 3 years ago)...the situation really isn't particularly "extraordinary" from a DVC booking point of view.
If you own the points you used for the canceled vacation, and if you canceled w/DVC/Disney at least the day before your arrival, your points are now in holding--meaning you cannot book using those points any earlier than 60 days prior to arrival, or outside the current use year. Restrictive to be sure, but hopefully you can use the points within those restrictions.
If you rented them, then the owner you rented from faces the same restrictions if he/she were to try to re-rent them. In this case you could ask the owner if he/she or you could try re-renting, and possibly get a refund (at least partial) if you're successful. But it is, generally, much harder to rent within the holding points restrictions...even if you (or the owners) find a renter, there's a reasonable chance it will be at a lower (to reflect the restrictions) cost per point. It's certainly not particularly "fair" to expect the owner to absorb the hurricane-related loss...
Anyway, some folks would tell you that weather cancellations are what travel insurance is for. I'm not a fan of travel insurance for DVC points (it doesn't return you points; it only gives you a maintenance fee-baesd value for them), but each person will make his/her own determination about that.
Bottom line: Sandy stunk and still stinks. But with the frequency of bad storms and disrupted travel as a result, it's neither unusual nor unfair to enforce a policy that dictates the degree to which--if any--a refund is possible.
Once again, my sympathy to you & your family. Hope you do have holding points that you can use to "make up for it."