I just efiled a clients mother without any problems, paid the taxes all is well, had to paper the state of AZ, because they wanted a copy of the DC for the $25 refund
As to charging for clients children, do not comit to the free ones until I see what they have, and then I just love the ones that the child files for free on line, takes there owen PE and then I get to charge for fixing two return, or fix one, paper file parents. When that happens the next year I have all of the returns, makes life easier for all.