Miss. Code § 91-5-7
Whenever any estate of any kind shall or may be devised or bequeathed by the last will and testament of any testator or testatrix to any person being a child or descendant of such testator or testatrix, and such devisee or legatee shall, during the lifetime of such testator or testatrix, die testate or intestate, leaving a child or children, or one or more descendants of a child or children, who shall survive such testator or testatrix, in that case, such devise or legacy to such person so situated as above mentioned, and dying in the lifetime of the testator or testatrix, shall not lapse, but the estate so devised or bequeathed shall vest in such child or children, descendant or descendants, of such devisee or legatee in the same manner as if a legatee or devisee had survived the testator or testatrix and had died intestate.
Miss. Code § 91-5-7