When you purchase the TurboTax software the license for the software allows you to e-file up to 5 federal tax returns for free. After the 5 federal e-files any further tax returns can only be printed and mailed. The tax returns filed can be for anyone not just family.
The license allows you to only install the purchased TurboTax software on computers that you personally own.
Go to this TurboTax website for the TurboTax software license - https://turbotax.intuit.com/corp/license/desktop.jsp
