I think it's more about your step fathers' computer 'comfort' level. Is he knowledgeable enough to install a scanner, scan the image into a photo editing program such as Photoshop Elements (that's what I use), do whatever touchups are needed, save the image, catalog it or at least put it in a folder that identifies the group of pictures? And then to have backup drive/CDs in case the hard drive they're on fails?
I'm a Social Security receiving geezer, but I've been in computers for 48 years now, so effectively using computers isn't a problem for me. But I have friends older and younger that barely know how to turn on a computer, and have to 'stretch' their knowledge just to do an email or play on Facebook.
So, depending on where your step father is on the computer knowledge scale, and how many photos he wants to scan, using an outside service do it might be a better solution. About a year ago, as a favor to a friend, I scanned in perhaps 200 family pictures in her fathers' estate, some dating back to the 1930s. With editing, naming, saving, etc, I think I spent 10-12 hours on the project.