Help a Fellow Anon

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So, I'll be straight to the point here, anon;
I'm still with my parents, and still in the age where they dictate the rules of the house. Now, due to some recent troubles with his parents, Dad has grown stressed and remorseful, so it means he often doesn't do whay he promised doing.
Now, there's this thing that he set up that denies me both computer and wifi during week days(aka school days), but, according to the agreement; I'm able to use both during weekends.
Now Dad's stressed, and he's gone to his parent's house at a city two hours from here. He didn't "unlock" the wifi thingy from his "high-tech" router.
How do I break into the router, since it is password-protected?
I have no trouble using the internet on my computer, since I already changed my MAC adress to his iPhone's. I want to use the internet through the game console, but I recon I can't change a PS4's local MAC adress.
Any help on how I break into his router? I don't have a clue if nMap and nCrack will work for a router, so I'm asking you guys for help.