Importing DVDs into iTunes

Hi, We are going on holiday next week and have some DVDs we'd like to put into iTunes so we can put them on our iPad. Does anyone know of any accessible way to do this on PC? I would do it on my Mac, but the iPad is synced with the library on my mums PC and we don't wanna override all the stuff that's already on there. If someone could reply with an accessible way to do this as soon as possible that would be great, as I need a way to keep my 6 year old sister quiet on the 4 hour flight :). Thanks.