La. Civ. Code art. 1318
Current with changes from the 2024 3rd Extraordinary Session effective on or before 1/1/2025
Not only the coheir himself, but the heirs of that coheir, and any other successor can compel a partition of the estate, and be themselves compelled to make it.
Note error in English translation of French text; "estate" should be "succession."
La. C.C. § 1318