S.C. Code Ann. § 62-1-504: Co-owners with right of survivorship; requirement of survival by 120 hours.

Except as otherwise provided by this Code, if:

(a) it is not established by clear and convincing evidence that one of two co-owners with right of survivorship survived the other co-owner by at least one hundred twenty hours, one-half of the property passes as if one had survived by at least one hundred twenty hours and one-half as if the other had survived by at least one hundred twenty hours;

(b) there are more than two co-owners and it is not established by clear and convincing evidence that at least one of them survived the others by at least one hundred twenty hours, the property passes to the estates of each of the co-owners in the proportion that one bears to the whole number of co-owners.