What is little brother in Navajo?

"My Little brother" in Navajo is shitsilí

atsilí -- someone's little brother

nitsilí--- your younger brother

nihitsilí ---- your or our younger brother

hatsilí --fourth person , a little like "one's little brother"

hatsilíké-- fourth person plural, "one's little brothers"

There are a lot more possibilities. In Navajo this is one of a kind of Word that always has to be in the possessive form. There is no "little brother". He must be somebody's brother.