Interestingly, "parents" doesn't have a simple singular form in German. If you're not specifically saying "father" or "mother", you basically have to say "parents-part": Elternteil. For "grandparent" it uses the same logic to become Großelternteil.
Since the grammatical gender is now based on the -teil root of the word which is masculine (from der Teil), even a mother can be ein Elternteil.
You can easily switch your keyboard back and forth between most any language. Worth the trouble if you're doing a lot of Duolingo or other typing in various languages. Mine is set up for English, French and German. I can switch back and forth just by hitting alt+shift. Google "add keyboard languages" and find appropriate instructions for your PC/Mac and operating system if you're interested. It takes seconds to do.
Fun fact: The Alt-Gr key is on German keyboards but not many English keyboards.
When using a physical keyboard on Windows I use WIN + SPACE to toggle between languages, and just remember where the special keys are. You have to install the language pack first (no, it doesn't change your interface to German).