How to connect back to my home Wi-Fi?

So I went to my Grandma's house and connected my brother's DELL laptop (He has Windows Vista) and my iPhone 4 to her Wi-Fi. Once I came home, I wasn't able to connect to my home Wi-Fi anymore. How do you connect the iPhone and laptop back to your home Wi-Fi?

Added (1). Okay let me make this clearer. It didn't automatically connect it back to my home Wi-Fi. When I went to settings and everything my home group or home network or whatever wasn't listed so I can't connect it back.

Go to settings Wi-Fi and the connect to your home one?

Delete all the existing Wi-Fi networks then scan. Select your home Wi-Fi then input the password and you're done.

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