How do you say older sister in Navajo?

ádí-- someones older sister
shídí --my sister
nídí - yours
hádí one's
nihidí -- their or ours
bidí -- his / her/it's
and more...
"older sister" is one of those words in Navajo that can only be in the possessive.
The marks over vowels are high tone marks not stress or accent. They change meaning.