WiFi troubles on my android?

Everyone at my house is having internet troubles on their phones, but when I use the computer it is just fine. It is my own houses WiFi and it always works, but now if I go on social media it will say that it's not connected. When I go to my wifi it says that I am not connected to anything but then when I click on the wifi options it says the one that I need with full bars. I click on it and then it goes back to the no wifi symbol. I don't understand why it's only on our phones