न चैकमकारणान्निर्विभजेत ॥ कZ_०३.५.१७ ॥
na caikam akāraṇān nirvibhajeta
Nor should he exclude (or separate out) one person without cause in the partition.
Arbitrary exclusion or adverse separation of a single heir without a stated, valid cause.
As a baseline: unequal outcomes require justification; otherwise the partition is presumptively invalid or contestable.