As a parent, I am doing everything I can to expand the universe in which my child and other non-binary people can feel comfortable. That’s what an ally does.
I’ve had conversations about gender identity with my parents and with cab drivers, with my closest friends and with checkout clerks. When someone I haven’t seen for months asks, “How’s Miriam?” I say, “They’re fine, thanks.” When a business associate asks, “You have three kids? Boys or girls?” I tell them, “I have two sons, and my oldest is non-binary.” Some people nod because they get it.
Most of the time, I have to explain further.