Comment Verizon HomeFusion Broadband (Score 1) 135
I know this isn't what you were looking for based on the summary, but you never know, sometimes there are options you've never thought about, so I'll posit it anyway:
Verizon Wireless offers HomeFusion Broadband for a professionally-installed, rooftop-mounted 4G home broadband service. It sounds like it's ideally suited to your parents, and for $6.99/mo, you get the peace of mind knowing that they will send a technician out to fix any issues that may arise.
I don't know if it's in your parents' price range (it starts higher than a Jetpack, but with a higher monthly bandwidth limit), but it's a fantastic option for those currently struggling with satellite or dial-up and have access to 4G LTE.