I was cutting up a freezer and cut a freon line - is it dangerous for my family?

SOURCE: HI i just bought a

No, it's supposed to be hot on its outside: just make sure the airflow around it is good, the compressor and the radiator at the back are clean and the power plug has a good grounding and a proper fuse and all will be OK.
In the worst case scenario you have a malfunctioning defrost resistance that is constantly on and when it will fry it will take the compressor with it, killing the freezer. But only it, the rest of the house and yourself are perfectly fine. If you want to prevent that you will have to dismantle the freezer and disconnect the resistance - without it the ice buildup inside it will be much faster so you will have to stop the freezer for deicing sooner than normal.