Router

Okay, so my dad's computer has the router that I connect to from my computer. I'm pretty sure theres a modem, but I'm not sure where it is. Anyways, I was wondering if I could buy a router and hook it up wired to my computer and still connect to the internet.
My dad has a dlink router and he can turn off/on internet from his computer.
So do you guys think I can get a wired connection from my computer to like the modem?

p.s. my computer upstairs his computer/router downstairs

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