(PEPEKE HENUA) is a sentence pattern that states the location of something. HAW 101
AIA (slide 1 to 13)
ʻAMI PIKO ʻO is used with iʻoa or proper nouns [names of people or places]. (slide 6 to 8)
AIA I HEA? (slide 11 and 12)
(Grammar Link): https://www.slideshare.net/malama777/pepeke-henua
Aia ma heo ʻo Bill? = Where is Bill?
Aia ʻo Bill ma hea? = Where is Bill?
Tita is being used as a name.
(ʻO) is used to indicate the subject of a sentence.