Why won't my iPhone 5 stay connected to my Wi-Fi?

We have recently been given a new router as our one wasn't connecting to broadband. Everyone else in my house is being able to connect to my Wi-Fi except me. I find this weird as my dad has the same phone as me and has connected to it just fine! My brothers iPad even connects!
I have reset the network settings!
I have even reset all of the settings!
And even if i do finally get it to connect it by doing it manually, it disconnects within seconds.
How do i keep it connected like it was before our old router packed up?

Thank you in advance to anyone that answers this, much appreciated.

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