Below is how to Set a Static IP on an iPad to attempt to fix them not being able to connect at home.
Open iPad Settings
Go to Wi-Fi
Click Edit at the top right (You will need to enter their iPad password)
Go to Wi-Fi
Click Edit at the top right (You will need to enter their iPad password)
Select "Manual"
Change the Settings to the same as below and click Save.
You may need to re-enter the subnet mask address before Save becomes available.
Click Manual and set the Servers as 8.8.8.8 and 9.9.9.9
Click Save.
Click Manual and set the Servers as 8.8.8.8 and 9.9.9.9
Click Save.