What kind of a tablet? If you don't have an insurance plan on the device, you will have to find a repair shop in your area but if this is a tablet that was less than $300, it may be cheaper to just buy a new one. Hopefully you had it set to back everything up because then you don't need to worry about anything stored on the tablet, it should all come back when you sign in on a new device. If you get another, make sure your kids have a separate one than the one you use. You can buy one for pretty cheap and then if they break it, just buy a new one because most times unless it's an expensive device, it's not even worth it. But you can try searching for PC/phone repair shops in your area. If they fix those, they likely fix tablets too. They can tell you if you're better off replacing the screen or just buying a new one. If this is something you have an insurance plan or warranty for, find out if it covers this kind of damage that isn't caused by factory defects. If it costs less to buy a new one than to fix the broken one, just get a new one.
