You can make a genitive case by attaching -(e)n to a word.
las e xia means Xia's hand. xian means Xia's.
mark t'avelant et avelanten. The scythe of the death is the death's.
tu et xian. This is Xia's.
kaam e xia. Xia's cheek.
te let flayu e miiko. Don't pull a cat's tail.
tu et noan. This is mine.
kai (big) → kain (something big)
fil (long) → filen (something long)