Suddenly my iPhone and iPad has decided my Wi-Fi password is incorrect?

My Wi-Fi password is correct, my laptop that's a windows and my moms phone that is a windows is still connected to Wi-Fi. What should I do?

Use Windows on your tablet and phone!

You can run this little utility on your laptop and it will display the current Wi-Fi password.
http://www.nirsoft.net/utils/wireless_key.html

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