Yes. I think you have to.
On the Windows Desktop program you have to manually save. It doesn't automatically save although it should ask if you want to save when you start a new return or exit the program.
Also if your Child's name (or another return) is the same or similar to yours then it might overwrite your return. You have to save each return with different names so you can tell them apart. Like if your name is John and your son is also named John or even just the same initial, it will save them with the same name so the second one will overwrite the first return. Go to File-SaveAs and give it a unique name.
You can sign into another account under File, then above Exit is Sign in or out.
