La. Civ. Code art. 814
Current with changes from the 2024 legislative session effective on or before 7/1/2024, from Acts 1-3, 6-671
An extrajudicial partition may be rescinded on account of lesion if the value of the part received by a co-owner is less by more than one-fourth of the fair market value of the portion he should have received.
La. C.C. § 814