I'm creating a list of family members:
Biological, Justin, 5/20/1981 Biological, John, 1/20/1987 Adopted, Jane, 8/12/1989 Step, Doug, 12/1/1979
When listing out the type of sibling, the word step seems odd. I've always used it as step-brother or step-sister but never on its own. Is there a better choice of word to use?