My Mac keeps connecting to the worng Wi-Fi

Alright guys, I've got here a very strange problem. Two of our Macs (MBP and MBAir) are connecting to the neighbour's wi-fi, while my iMac is completely fine. Windows laptops as well. However, if I delete his Wi-Fi from preffered networks, I can't even see my Wi-Fi, until I connect to their network again. We've been having this problem for over two months. Tried rebooting router, doesn't help. What helps for a while, is resetting factory settings in router but after approximately one week, we're facing the same problem. I've been having troubles connecting to the Wi-Fi with my Barnes & Noble Nook as well, however iPhone, iPad or Windows Phone are connecting fine. I've absolutely no idea what's going on, would you please help me?
Thanks and sorry for mistakes, I'm not a native speaker.

Change Chanels in your router
and tell your apple network to forget your neighbours router settings
Ensure that your neighbours settings are not shown in
System preferences/Network/Advanced/Wifi
If they are then remove them with the - symbol
also see
http://forums.macrumors.com/showthread.php?t=452425

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