Disclaimer: I know that this is a comon question, but none of the others have been healpful
I am moving in with my Grandmother soon. She has Fios already set up with one router (pluged into coax). The router is in her bedroom and therefore cannot be conected to anything via ethernet without drilling holes in the floor/wall/ceiling. We cannot unplug (or therefore move) the router to a better location. The office has a coax port in the wall. I have a Fios router from my dad's house that he no longer needs. Can I plug my dad's router into the coax in the office and have it give me internet through ethernet? This would be without any further setup of the secondary router. If not, can I do this without unpluging the already set up router, with some setup of the new router?
Thank you in advance for any (helpful) answers.