I have one iPad that will connect to our wifi but I have another one that will not, why is that

I have an iPad that will not connect to the wifi at our house. My sister also has an iPad and it connects automatically. Mine is the only one that will not. I can't figure how to get it to work. I have taken my iPad other places with wifi and it connects right away. I know that some wifi systems have a limit on how many things can connect to them but I have even gone so far as turn off the wifi on every device that we have that connects to the wifi and it still doesn't work. I don't know what to do or how to get it to work?

Look at iOS Troubleshooting Wi-Fi networks and connections  http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks  http://support.apple.com/kb/ts3304
iOS: Recommended settings for Wi-Fi routers and access points  http://support.apple.com/kb/HT4199
Additional things to try.
Try this first. Turn Off your iPad. Then turn Off (disconnect power cord) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
Go to Settings>Wi-Fi and turn Off. Then while at Settings>Wi-Fi, turn back On and chose a Network.
Change the channel on your wireless router (Auto is best). Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
Another thing to try - Go into your router security settings and change from WEP to WPA with AES.
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
If none of the above suggestions work, look at this link.
iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Fix iPad Wifi Connection and Signal Issues  http://www.youtube.com/watch?v=uwWtIG5jUxE
Fix Slow WiFi Issue https://discussions.apple.com/thread/2398063?start=60&tstart=0
Unable to Connect After iOS Update - saw this solution on another post.
https://discussions.apple.com/thread/4010130
Note - When troubleshooting wifi connection problems, don't hold your iPad by hand. There have been a few reports that holding the iPad by hand, seems to attenuate the wifi signal.
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If any of the above solutions work, please post back what solved your problem. It will help others with the same problem.
 Cheers, Tom

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