Signed Will of parent is not attested by any witness. Is it valid in Mississippi?

No.  The Will should be witnesses with witness signatures in accordance with Mississippi law. Therefore, the estate would fall under the laws of intestate succession (no-will), and past to heirs under intestate succession law.  If not married but there are children to his or her children.  If married, to spouse and children.

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All content is for informational purposes only. It is also only intended to relate to Mississippi Estate Planning Law.  If other states are mentioned, they are mentioned as an example only. No legal advice is provided in this content. Laws change so you need to check for any updates by current laws in Mississippi.