"ʻO wai kou makua kāne hūnōai?"

Translation: Who is your father-in-law?

[RonRGB]

hūnōai

[PE] 1 Father- or mother-in-law, usually after makua and followed by kāne or wahine for specific designation of sex. These terms apply also to uncle and aunt by marriage. [PCP fungawai]

[LA] 1 n A parent-in-law, either father or mother, according to the designating terms kane or wahine. See HONOAI.

link: http://wehewehe.org/gsdl2.85/cgi-bin/hdict?e=q-11000-00---off-0hdict--00-1----0-10-0---0---0direct-10-ED--4--textpukuielbert%2ctextmamaka%2ctextandrew%2ctextparker%2ctextchd-----0-1l--11-en-Zz-1---Zz-1-home-h%c5%abn%c5%8dai--00-4-1-00-0--4----0-0-11-00-0utfZz-8-00&a=d&d=D105061

[Jessi784299]

so aunt or uncle by marriage would be "ʻanakē hūnōai" or "ʻanakala hūnōai" ?

[MojaveMama]

Why are the in-laws "o" class?

[Eliza727459]

They would be the older generation, usually O-class. Or, you might pick your spouse, but you don't really choose your in-laws!

[KarinLynn1]

Just wondering why there is a female avatar (whatever) for this exercise? Does that mean this is just the father in law for a woman (not a man)?

Although not complete, this link helps a little bit:
https://hilo.hawaii.edu/wehe/?tag=family