"E nānā ana lāua i ka hoʻokūkū i kēia lā."

Translation: They two will watch the match today.

[oruga_fantasma]

I think "The two of them will watch the match today." would be a better translation for this sentence.

[GeraldMath4]

Yes! One couldn't get away with that English out loud. It would sound like "They too will ..."

[lynneo]

"They two" is not proper grammar. I agree with oruga_fantasma and GeraldMath4 for their reasons given.

[MojaveMama]

Lāua was probably used to familiarize us to a dual pronoun.
Remember, Hawaiian has singular, dual and 3+.

[RowanM.1]

"They two" is bad English. It should be "These two", "those two" or as suggested by orgua_fantasma, "the two of them". But not "They two". That just sounds terrible, and as GeraldMath4 rightly pointed out, ambiguous when said out loud.

[Kn.Wolfsbane]

This feels really clumsy to translate, I'm sorry.
I get there are differences in the languages but when this is translated like it is here, it becomes confusing.