As unfortunate as this circumstance is, disasters (whether natural or man-made)
happen daily. You should always plan for worst-case scenario, no matter
how remote the possibility. In the case of this type of circumstances,
you can include a clause in your Estate Planning documents that address
who will inherit your property if “everyone” in your immediate family dies simultaneously. In this case, you
may want to name your parents, siblings, or a charity as an alternative
beneficiary. Although you never want to think of the worst-case scenario,
in Estate Planning – you must plan for every possibility.