Lets get some terms straight
Developing. Developing the film that you have exposed using a camera. The results are a negative which can be printed as photographic prints
Printing: Using either a photochemical process to produce images (called prints) using either negatives, transparencies or a digital file or using a digital file to print images using an inkjet or dyesub printer.
What happens inside a digital camera can be considered developing since the digital file is changed from a series of zeros and ones into a viewable image either on the cameras LCD or computer monitor. If you shoot using RAW, the "development" happens later using a computer program which "develops" the RAW data into a photo image.
So, what is it your dad wants to do? Take the image files to a photo lab and have prints made, but does not want prints made using your home printer?
Let us know and we will hopefully be able to help you further.