insider.si.edu: Pair of gloves from the gill man costume used in Creature from the Black Lagoon
Pair of gloves from the gill man costume used in Creature from the Black Lagoon
Yahoo: Ariana Grande was unrecognizable in her 1950s 'Creature from the Black Lagoon' inspired Halloween costume
Add Yahoo as a preferred source to see more of our stories on Google. Ariana Grande channeled a 1950s horror movie monster for Halloween. Grande transformed into the "Creature from the Black Lagoon" ...
Ariana Grande was unrecognizable in her 1950s 'Creature from the Black Lagoon' inspired Halloween costume
"Adult children" comes from "adult children of alcoholics", but now has broader reference to adults who were abused emotionally, physically or sexually in childhood.
Merriam-Webster has an entry for half-orphan, meaning someone with only one living parent. They say specifically a child, which would match the usual usage of "orphan" (as mentioned in the question), but it might be used of an adult sometimes, either jocularly or by extension. This doesn't distinguish which parent is dead, but could be combined with a further explanation if it matters.
The best way to do it, I think, would be to forgo the hyphens completely and go with: I am a psychologist who works with children and adults. Anything else is awkward, ambiguous, or both. If it's necessary to emphasize that this individual works with children and adults (i.e., this isn't just introductory information), you could add in a 'both': I am a psychologist who works with both children ...