IPhone shows a Wi-Fi signal but Internet won't work?

So whenever I'm at home, my iPhone says I can connect to my Wi-Fi and it shows three bar things. However whenever I go on to safari or and Internet requiring app, it never loads. Says can't connect to the page.

I can have working Wi-Fi in public places, vacation homes, and at my own apartment but at my old house or my parents home, my Internet will not load despite the fact it says it's connected to Wi-Fi. Everyone else in my family doesn't have this problem but ever since I moved out and use other wifis, I can't connect use my parents Wi-Fi

I have a iPhone 4S without iOS 7, I think it's still the old iOS 6 something

Take it to the apple store

Try restoring your iPhones network settings or restore your iPhone

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