Mothered nine kids with six instructors. Please advise.

I wasn't one of the people who downvoted you, if that's what you're asking. I guessed (and it seems to be confirmed) that you just aren't used to thinking of "they" as singular.

I'll admit I am a bit opinionated on the subject of neopronouns; I have strong prescriptivist tendencies when it comes to changing language and I dislike meaningless gibberish. I won't hate or mock someone if they prefer neopronouns, but I feel like it's either reinventing the wheel (since we already have NB pronouns) or trying to force more grammatical genders into the language.

English has four genders: masculine, feminine, neuter, and nonspecific. There are four third-person singular pronouns: he, she, it, and they. Each corresponds to one grammatical gender.

"They" has been used as a singular pronoun since at least the time that Chaucer wrote the Canterbury tales, close to a thousand years ago. However, recently it has become associated with non-binary people (NBs) who prefer to be referred to as "they" rather than by a gendered pronoun. Many people in the USA are bigoted against NBs, and bigots would generally rather be hateful than factually correct.

Personally, I vastly prefer "they" over the slew of neopronouns that have been invented in the last few years.