My friends mother has been suffering with metastatic cancer in lungs bone and liver how are her chances of living?is this easily cureable?

This is something she will have to ask her doctor. We don't know her treatment regime. Easily curable? No, it's not easily curable unfortunately, particularly because it is 1) metastatic (which means it has spread through the lymphatic system); 2) it's in the bone, which is particularly hard to cure; and 3) the cancer has spread to the liver.

Fourth stage cancer is by far the worst of the staging process.

I am so sorry to have to say that most likely at this stage, with this amount of metastases, that she may not have much time left. Has her doctor told her how much time she has?