iPhone 7 trouble connecting Wifi

My iphone 7 stopped recognizing password for wifi connection at home. My daughter's iphone has the same problem. We have the signal. We used to be able to connect automatically when we chose the network. Now it asks the password, and when we type in the correct password, we get the error message "incorrect password." This started yesterday. Today, my daughter's Macbook stopped connecting the wifi in the same way. All other macbooks and iphones of the family members are fine. We tried restarting the devices, and manually typing in IP address, Subnet Mask and router number, but no luck. Any suggestions?