No, there is only one Kansas so it has no plural form. The possessive form for the proper noun Kansas is Kansas's.
Singular possessive: secretary's Plural: secretaries Plural possessive: secretaries'
The plural is lads. The plural possessive is lads'.
The plural is relatives. The plural possessive is relatives'.
The plural form is Mexicans. The plural possessive is Mexicans'.
The plural form is echoes. The plural possessive is echoes'.
kansas'
Singular possessive: secretary's Plural: secretaries Plural possessive: secretaries'
The plural is lads. The plural possessive is lads'.
The plural is relatives. The plural possessive is relatives'.
The plural form is Mexicans. The plural possessive is Mexicans'.
The plural form is echoes. The plural possessive is echoes'.
The plural form is inches. The plural possessive is inches'.
The plural possessive of stepsister is stepsisters'.
The plural form is suffixes. The plural possessive is suffixes'.
The plural possessive of desert is deserts'.
dwarves is the plural possessive of dwarf.
The plural possessive form of "weeks" is "weeks'."