If property, including community property with a right of survivorship, is owned so that one of two joint owners is entitled to the whole of the property on the death of the other, but neither survives the other by 120 hours, one-half of the property shall be distributed as if one joint owner had survived, and the other one-half shall be distributed as if the other joint owner had survived. If there are more than two joint owners and all of the joint owners die within a period of less than 120 hours, the property shall be divided into as many equal portions as there are joint owners and the portions shall be distributed respectively to those who would have taken if each joint owner survived.