You probably have a sense of how secure your job is -- though no job is completely secure. I think that knowledge coupled with the guidance of the spirit can help your family decide how much of a financial reserve you need.
At first glance, you might assume that three-months' worth of savings is a huge amount. And I guess it is, IF you make tons of money already. But for the rest of us, the amount is not as big as you may first think. If the amount of money saved is used to replace your salary, many normal monthly costs would not apply. For example, you probably already paid your tithing on money in savings (so no need to subtract 10%). Also, retirement, taxes, social security, medicare, and state taxes would not be taken out of your savings (this would differ depending upon your state/country). If you add up your normal bills for each month, minus any services that you could immediately cancel like cable, cell phones, lawn services, gym memberships, etc. (I'm assuming that you would cancel everything that you were able to -- but don't forget those "contracts" that bind you to a service for several years), then you can figure out what you would need to save for a month's worth. For our family, the amount we needed to save "essential family obligations" was roughly half of my husband's normal paycheck per month.
In many cases, this financial reserve may not end up being used to replace salary. It might be needed in an extreme health care situation. Or it might prevent you from having to use consumer debt when your clothes dryer, dishwasher and toilet all break on the same day (which happened to us yesterday). So obviously more is better than less.
[variation on a previous post from 8.11.2008]