La. Civ. Code art. 1318
Current with changes from the 2024 legislative session effective on or before 7/1/2024, from Acts 1-3, 6-671
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