S.C. Code Ann. § 62-1-502: Requirement of survival by 120 hours; individuals, two or more beneficiaries, class members.

(a) Except as otherwise provided by this Code, where the title to property, the devolution of property, the right to elect an interest in property, or any other right or benefit depends upon an individual's survivorship of the death of another individual, an individual who is not established by clear and convincing evidence to have survived the other individual by at least one hundred twenty hours is deemed to have predeceased the other individual.

(b) If the language of the governing instrument disposes of property in such a way that two or more beneficiaries are designated to take alternatively by reason of surviving each other and it is not established by clear and convincing evidence that any such beneficiary has survived any other beneficiary by at least one hundred twenty hours, the property shall be divided into as many equal shares as there are alternative beneficiaries, and these shares shall be distributed respectively to each such beneficiary's estate.

(c) If the language of the governing instrument disposes of property in such a way that it is to be distributed to the member or members of a class who survived an individual, each member of the class will be deemed to have survived that individual by at least one hundred twenty hours unless it is established by clear and convincing evidence that the individual survived the class member or members by at least one hundred twenty hours.