The screen is the single most expensive part. You can't repair a cracked screen, only replace.
As above, that replacement is likely more than a whole new TV.
The kids just spent their allowance for the next 5 years.
If something is broken on the screen/display of the TV, buying a new TV is the more cost efficient unfortunately.
But hey! You get your reason to get the brand new 75" Q9FN!
Just say it is the kids's fault!