I am prearing taxes for myself, my mother-in-law and my teen daughter. Do i have to buy TurboTax 3x or is there a product to buy that allows multiple returns?

Get the CD/download if you have a full PC or Mac that meets the system requirements.  That way you can prepare and e-file up to five federal returns and state returns for one specific state of your choosing ( if you need an additional different state you can pay for that too).

2021 TURBOTAX

CD/DOWNLOAD (This requires a full PC or Mac—-cannot be used on a mobile device)

https://turbotax.intuit.com/personal-taxes/cd-download/

You can also purchase the CD/download from various retailers such as Costco, Amazon, Walmart, Best Buy, Staples, Sam’s Club, etc. etc. etc.

This link Where can I obtain authentic TurboTax software? has a list of authorized TurboTax resellers.

When you use desktop software, there is an additional fee to e-file a state return.  You can avoid that fee if you print, sign and mail the state return.  The state e-file fee is $20 and increases to $25 in March.

https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-mac-software/00/25609

https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-windows-software/00/26175