"My maternal grandfather has an older brother."
Translation:Shicheii ánaaí bee hólǫ́.
Yáʼátʼééh! The hints that show bee meaning he or she are not accurate.
bee = with (or by means of) him / her / it
hólǫ́ = it exists / there is
The combination of these two words can mean he / she / it has. Also, I have found some exercises that use only hólǫ́ with the same meaning, and on the same position. Other exercises can show the sentence order as subject + postposition bee + object, with the same meaning.
While shí is the first person singular pronoun, the third person singular (he / she / it) and duoplural (they two) pronoun is bí, not bee.
In this exercise, the sentence construction would be:
Shicheii (shí + acheii, my / I + maternal grandfather / maternal great-uncle), shicheii is the singular first person inflection, and acheii is in the indefinite inflection) + ánaaí (elder brother, indefinite inflection) + bee (with him / her / it / they two, singular and duoplural third person postposition) + hólǫ́ (there is / there are, ho-, space, area, things, indefinite deictic 3rd-person subject pronoun + -◌́-, ni-modal 3rd person subject prefix + -Ø-, classifier, in the voice marker position or valence-change prefix position, usually marks an active verb as intransitive + -lǫ́, neuter imperfective stem of root -LĮĮD, “to exist”; the imperfective aspect is used for incomplete actions, and can also include progressive, habitual, and iterative aspects. See Classifiers: https://en.wikipedia.org/wiki/Navajo_grammar)
My + maternal grandfather + an older brother + with him + he exists (sentence order: S-O-V)
More discussions about Navajo (Wiktionary):
Edit: It seems that a different word combination can be used in Navajo.
Shicheii (my maternal grandfather) bínaaí (his older brother) hólǫ́ (he exists)
I hope it helps. :)