How do I file a extension for a second family member?

If you have a separate TurboTax account set up for them, follow these steps

1. On the left rail menu in TurboTax Online Select Tax Tools  (You may have to scroll down on the left rail menu.)
2. On the drop-down select Tools 
3. On the Pop-Up menu titled “Tools Center,” select File an extension
4. Follow the instructions to start the extension process

Also, you may have to do your state taxes: Do I need to file an extension for my personal state taxes?  

Remember, an extension gives you more time to prepare your taxes, but it doesn't extend the time to pay your taxes.  If you have an indication that you will owe taxes, you should make the payment by the original due date of the tax return to avoid additional interest and penalties.