Mississippi Code
Chapter 3 - Uniform Simultaneous Death Law
§ 91-3-9. Joint tenants or tenants by the entirety

Where there is no sufficient evidence that two (2) joint tenants have died otherwise than simultaneously the property so held shall be distributed one half (1/2) as if one had survived and one half (1/2) as if the other had survived. If there are more than two (2) joint tenants and all of them have so died the property thus distributed shall be in the proportion that one bears to the whole number of joint tenants.