My iphone won't connect to my Wi-Fi at home?

I have an iphone 5c and it won't connect to my router. When i got it it worked but i don't know what happened. It worked for about a month out of the blue it started using data. I know my password but it won't allow me to go. Yes i have reseted it but everybody in my family has access

Go into settings where Wi-Fi is go to the network you want to be on click the arrow on the right side of the network then select forget network after that exit out then try and type in your password is should work

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