Hi, Dorothy!
Yes, it will have to be aGEDCOM format file for the data to be accessible to the functions in the package. It could be a lot of work to create that file by hand because there should be cross-referencing between individuals and families via the pointers. You might try creating a trial account in Ancestry.com just to make it easier to enter your persons and families, and then export the family tree as a GEDCOM file. That way all the cross-references are automatically generated.
If other users are interested, I could add some functions to the package for adding persons, spouses, and children to make this task easier.
Bob