My wife and I have simple California Wills, using a standard online form, that leave everything to each other. There is no language on this form, however, for a contingent beneficiary. If one of us dies, therefore, the survivor will be temporarily without a Will that makes any sense. Until the survivor has a chance to write a new Will, each of us would like everything to go a particular individual. (Call him John Smith.) Can we simply each add a paragraph to our respective current Wills saying, "If my spouse predeceases me, I leave all my assets and my possessions to John Smith."