No, you can use your CD to prepare unlimited returns and to e-file up to 5 federal returns.  That's one of the advantages of using TurboTax Desktop (CD/Download) platform.   And your Deluxe CD is one "level" up from Basic, so you're in good shape. 

You'll select "Start a New Return" in your TurboTax program and work through the interview on your sister's return.  

*Please click the thumbs-up icon if this response was helpful.
**Please click "Mark As Best Answer" if your question has been resolved. Thank you.

If you have desktop software (CD/download) you can prepare multiple returns.  You get up to five free federal e-files.  If you prepare a state return there is a fee to e-file the state but you can avoid the fee if you print and mail the state instead of e-filing it.

Any version of desktop software has all the forms and schedules.  It will be fine for your sister's return.

Be sure to save your return with a unique name to tell them apart.  Go up to File-Save As.  Each tax return is saved as a separate file ending in .tax2019.