Fifth District Court of Appeals Shed’s Light on the meaning of the requirement that witnesses must sign in the testator’s presence. A frequent issue in contests involving the validity of instruments, whether a last will and testament, trust or trust amendment, or even a prenuptial agreement, is whether the instrument was properly executed or signed. Section 733.502 of the Florida Probate Code provides that, among other things, it is essential to the validity of a last will for the witnesses to sign in the testator’s and each other’s presence. An improperly attested, signed or executed last will cannot be admitted to probate.