Go to your web browser and type in either 192.168.1.1 or 192.168.0.1 . It should pop up with a little login thing that requests an username and password. If your parents didn't change it, it should be either:
user: admin
pass: password
or
user: admin
pass: admin
If they did change the password, you're out of luck unless you know what they changed it to.
If you are able to get into it, let me know what brand of router it is (Netgear, Cisco, Linksys, etc.). I can help you get rid of the schedule that turns it off, or at least extend it.
Please note: This will only work if you are connected to your router via a wired or wireless connection. If you are out of your house, it will not work, but I bet you knew that.