A trans parent would likely still want to be called “Mom” or “Dad”, I assume. At least that’s the case with the few trans parents I know.
Parents don’t usually use “daughter” or “son” as pronouns, so I don’t think it would come up with non-binary children.
Do children of non-binary parents call their parents by their first name? It seems unlikely that they say “Parent, may I please have more screen time?”.
Tata instead of mama or papa? But also, what about parent’s siblings, or sibling’s children?
Nephew/ niece is nibling. Like sibling.
In that same vein I’ve seen pibling for aunt/uncle.
Good question. I guess first name or nickname is most likely.