IPhone 5s can't connect to Wi-Fi?

So I have my own Wi-Fi and it can connect to perfectly but at my cousins house it can't connect no more. They have century link and I'm putting the password correctly because it doesn't say the password wrong. They have iphone 5 that are connected to it so my phone must have a setting changed. Do any of you know how to fix it

Maybe they restrict their network to only known mac addresses?

Hard to say what is wrong without more details.

Is the network 2.4 GHz or 5 GHz?
What kind of encryption?
Etc…