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Resources for parenting a nonbinary teen?
(slrpnk.net)
An inclusive place for members of all stripes that don't fit into our culture's binary categories of gender.
(Disclaimer: no experience with nonbinary children, but I do have a trans sister fwiw)
Have you asked them? They probably did already find some resources that helped them figure themselves out that you may like. In addition they might not want you to make a big deal out of it, or maybe they do want to make it a big deal?
Good luck to you and them!