Parents:

- parent

- responsible adult ("RA" for short)

- meal planner

- diaper dealer

- warden

- DNA donor

- spawn point

Siblings:

- sibling

- wombmate

- anklebiter (if younger)

- yardstick (if older)

Polite Pronouns:

- kind soul

- fellow stranger

- air sharer

- dear (works for everyone)

- love (works for everyone)

- young one

- elder

- cohort

Other Pronouns:

*Cheat: Steal them from other languages

Navajo: bí

Hawaiian: ia

Malay: orang, kawan

Azerbaijani: o

Pipil: yaja

Umbundu: eye

Bengali: সে (şé)

Telugu: -ది (-di)

Chechen: иза (iza)

Mapudungun: fey

Tahitian: ’oia

Bashkir: ул (ul)

Kazakh: ол (ol)

Mongolian: тэр (ter)

Aymara: jupa

Chichewa: iye

Lakota: iš

Tlingit: hú

Tagalog: siya

Uyghur: ئۇ‎ (u)

Uzbek: u

Turkmen: ol

Turkish: o

Taos: ą́wąn

Wolof: moom

Chuukese: iiy

Tatar: ул (ul)

Georgian: ის (is)

Fijian: koya

Quechua: pay

Tibetan: ཁོང (khong)

Malagasy: izy

Guaraní: ha’e

Swahili: yeye

Haida: hal

Persian: او‎ (u)

Havasupai: nyihá

Cherokee: Ꭰ- (a-), Ꭴ- (u-)

Comanche: iʔ, maʔ, oʔ, uʔ

Yapese: qiir

Pitjantjatjara: paluṟu

So English lacks the gender neutral options other languages have already. Just pick the ones you like and "borrow" them like the English do with everything else in the world.

Other Options:

- Use their name (and work on remembering it!)

- Use their nickname (with permission)

- Use their title/profession ("doctor" "professor" "student" "cadet")

pronoun (he/him/his/she/her/hers): ze/zim/zis

parent (mom/mother/dad/father): zether, zed (I recently found out from batmaninwuhan that a zether is a musical instrument, and I feel like that just makes the word that much cooler)

term of respect (ma'am/sir): sher/zar (at some point some kid used to call me "sher" and I decided that I liked it as a gender neutral term)

general title (Miss/Ms./Missus/Mrs./Mister/Mr.): This one I'm really not sure about. I kind of like "Master." That seems like something that can be used across all genders, and it's a word that already exists, which makes it easier to be adapted to nonbinary purposes.

I forgot to include this in the challenge, but if you want, you can do something for "guy" or "girl." Mine would be "no-bi." I sort of like the way it flows.

Let me know what you think!

Just to add a few more to the list:

Wiin: Ojibwe. He/she him/her.

Wiya: Cree. Broad 3rd person term that can refer to people of either gender, animals, or objects. I thought this was an interesting one because it is so different from the way we catergorize things.

Two-Spirit: Is the general aboriginal term for a person with both a masculine and feminine spirit. Called “winkt” in Lakota.