Wi-Fi not working on apple products?

This morning the Wi-Fi was working fine.

Now my Macbook and my iPod and my brother's iPhone will not connect to the Wi-Fi. However our Dell computer and my brother's Sony laptop works fine.

When selecting which spot to connect to, it comes up as 'unavailable' or the password is invalid.

How can this be fixed?

Added (1). Friends' apple products are working fine.

Dad's HTC isn't working.

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