Did your brother have his own account? You should not prepare anyone else's returns in your brother's account. Plus it would be HIS prior information that would flow into a 2017 return. Only 1 Federal return can be prepared per account per tax year. If you decide to use Online TurboTax, you would need to have two additional accounts--one for your joint return and one for your daughter.
If you wish, you can use the desktop product for multiple returns, as xmasbaby0 explained in her Answer on this page.
