This means the OP's parents' fridge is probably running 100% of the time and doesn't manage to transport the heat outside anymore faster than it is re-entering. Basically it's broken.
A random 18 cu ft fridge claims it will use closer to 400 kWh / year, or around 1.1 kWh / day.
The random commenter on this thread has an 8 cu ft fridge which uses around 0.5 kWh / day.
Is the GP's parent's fridge "old" or is it "giant"?
Its factory rating when it was brand new was 237 kWh/year. Instead, it's around 683 actually (~1.87kWh/day)
This means the OP's parents' fridge is probably running 100% of the time and doesn't manage to transport the heat outside anymore faster than it is re-entering. Basically it's broken.