My daughter and son-in law want to do their taxes on my turbo tax. ( I know i can have 5 federal) I know we only get one state. Will I be charged

Here is how the desktop works

You  can do unlimited returns -federal and state 

you can only efile federal 5 times - IRS policy ; the rest can just be submitted in paper form . No charge 

you need to buy any additional states that you need but once purchased you can do unlimited returns 

you are charged to efile the state return in most states (NY is free) but you can mail in paper form and avoid these charges 

make sense? 

Are all the state returns for the same state?  In the Desktop program you get one free state PROGRAM download to prepare unlimited state returns. Then each state return (including the first one) is $20 to efile, usually goes up to $25 March 1. Or you can print and mail state for free.  

Is this the first time you use Turbo Tax Desktop program?  You can do unlimited returns and efile 5 federal.

FYI - Be sure to save frequently, go up to File-Save or Save As.  Save each return with a name you can tell apart from another one.  Especially if another return has the same name or initial.  Like a father and son.  Or if you have the same name the second return might overwrite the first one.  

I have Home & Business also if you have questions.   Are you on Windows or Mac?