grazhdanin

/ɡraʒdanin/

Cases

SingularPluralWhen to use it
nominativegrazhdaninthe citizengrazhdaninlethe citizensthe plain dictionary form — the doer of the sentence
genitivegrazhdaninnithe citizen'sgrazhdaninlenithe citizens'the owner — whose it is
accusativegrazhdaninnithe citizen (as the object)grazhdaninlenithe citizens (as the object)a specific, known object — whom or what
dativegrazhdaningeto the citizengrazhdaninlegeto the citizensdirection or recipient — to where, to whom
locativegrazhdanindeat / in the citizengrazhdaninledeat / in the citizenswhere it is; also having — mende bar, "I have it"
ablativegrazhdanindenfrom the citizengrazhdaninledenfrom the citizenswhere it comes from; also "than" when comparing
When to use each case
nominative
the plain dictionary form — the doer of the sentence
genitive
the owner — whose it is
accusative
a specific, known object — whom or what
dative
direction or recipient — to where, to whom
locative
where it is; also having — mende bar, "I have it"
ablative
where it comes from; also "than" when comparing

The endings are the same ones the pronouns wear — that page explains when each case is used.

With an owner

One ownedSeveral owned
mygrazhdaninimmy citizengrazhdaninlerimmy citizens
yourgrazhdaniningyour citizengrazhdaninleringyour citizens
his / hergrazhdaninihis / her citizengrazhdaninlerihis / her citizens
ourgrazhdaninibizour citizengrazhdaninleribizour citizens
you all'sgrazhdaninigizyou all's citizengrazhdaninlerigizyou all's citizens
theirgrazhdaninleritheir citizengrazhdaninleritheir citizens

The overlap in the last rows is real, not a mistake: grazhdaninleri can mean "his / her citizens", "their citizen", or "their citizens" — context decides.