You can choose "Someone
else". As long as you are preparing for a family member and they are aware
of what you are doing, there should not be a problem if you file a return for
them. You can also choose "My spouse/partner and me", but while you
are preparing the return, please keep in mind that the interview questions will
refer to “You” and “Your Spouse”, but it will actually mean your parents.
https://turbotax.community.intuit.ca/replies/2647762
