Does Turbo Tax offer a discount for doing multiple people's taxes online- i.e. all my family members?

[Texas Roger]

No there is no discount for multiple returns. It would be more economical for you to use the CD/download product installed on your computer. You can prepare an unlimited number of returns and efile 5 federal returns. 

With the online product, you must create an account for each tax return that is prepared and pay for each account.