My father in law got a DVD from his granddaughter, he wants to get it onto the computer so he can share it with the rest of the family. Can anyone recommend a really easy to use piece of free software that will convert this DVD to digital files, ideally mp4?

I know I can use Google, but I'd have to install the software and check it out before I can recommend it, so I was hoping someone already knew of a good piece of software.