My wifi on iphone doesn't work in certain parts of my home

So I got home from a trip to Key West, and I installed the new 7,1,2 and I noticed my wifi wasn't really working while I was in my room. I thought it was just my internet was acting up so I let it be. Then after a little I tried to go on facebook, instagram, pretty much any app that uses internet and it just wouldn't load and then I'd go on safari and it wouldn't work either it would just keep loading and then after awhile my my wifi would disconnect from my phone. I went to my parents room (Which is where the router is) and my wifi started working. So I went back to my room and then it stopped working. I noticed that my wifi on my phone only works when I'm in the living room or my parents room (The living room is right next to my parents room) and this is ODD because before my trip it wasn't doing this. I personally don't know if it is because of the new IOS update but this is very frustrating. I have a Gateway laptop and a xbox 360 in my room and they both connect to the wifi easily and work fine (Al though the internet on my computer is a little slow) , I have at&t uverse btw. I tried everything. Forgetting this network, Resetting internet settings, resetting my phone, resetting the router. My parents and brothers also have iphones and their wifi works in any part of the house. I took our ipad and put it in my room and turned off wifi for both my iphone and the ipad for 10 secs then turned it on and the ipad connects quick and safari works fine, but my phone just won't connect to the wifi when I'm in my room. Any Ideas?.. What should I do/can do