Without the qualifiers. That would eliminate a lot of the complications and explanations. If you and your offspring both have a sense of humor about it, you could say progeny, heir, successor or descendant.

Whatever works for you is best, though.

I refer to my 44 and 46-year-olds as my kids

I recently had this conversation with a friend. I’m old enough that I’m still adjusting to the concept that “they/them” is not necessarily plural, but trying to be sensitive, not be a dope, and learn.

I ran into a former neighbor and asked how “Johnnie” is doing. That neighbor said, “‘Johnnie’ is now ‘Isabel,’ and doing great - finally!” Well, Isabel is heading off to college, so while my kids will always be my kids, I really wanted a way to refer to this young adult as something other than “kid” or whatever.

So I love your new word! And I love your ANBO!

I have an English degree, and I can be a bit obnoxious in correcting people's grammar. I finally had to just say to myself, "I love my family, I love my anbo, and if this is what they want and need, then I will do my best to adjust."

I later read that, according to Wikipedia, the first use of the singular "they" in literature is from the poem Guillaume de Palerme, from 1375. Not sure why, but that made using a little easier for me.

So many people won’t even put in the effort to merely call their trans/ nonbinary family by their pronouns much less new name.

But you love and respect your offspring so much that you are willing to coin a new acronym just for them!!! I wish more people where like you!!!