2011 macbook pro with Mavericks - do I need install disks to erase hd?

So I inherited my dad's 2011 macbook pro and updated to Mavericks, and added myself as a user on the computer. I want to erase the HD so that I can start over, be the only user, 'own' the computer, etc., but when I open disk utility the erase buttons are grey. I also don't want to erase the HD and find out that I need to order 2011 era OSX install disks. What's the deal? Thanks!

You can't use Disk Utility from the drive that you want to erase. Depending on whether you have an early or late 2011 machine, it may have shipped with Snow Leopard, and with discs, or with Lion, and no discs.
Go under the Apple menu and select "About This Mac", "More Information," and see if it's an early or late model. If it's a late model you can do what you wish with no discs, using only Internet Recovery.
Call back,
Clinton
MacBook Pro (15-inch Late 2011), OS Mavericks 10.9.4, 16GB RAM, 960GB SSD, 27” Apple Thunderbolt Display

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