After the tragic death of his son Sage, Sylvester Stallone’s half-sister Toni Ann Filiti is in critical condition in UCLA hospital, suffering from lung cancer, The Post reports.

Filiti, 48, has been living in Santa Monica with mom Jackie Stallone, 90, as she battled the disease, but was rushed to the hospital two weeks ago when her condition worsened.

Grieving Sylvester, 66, is in France with his wife, Jennifer Flavin, and three daughters as he struggles to cope with the loss of Sage, who was found dead in his Los Angeles home July 13.

But Jackie told The Post: “After losing my grandson, this has been too much to bear. Toni Ann is not doing well at all. She has lung cancer Stage 4, she has liver cancer, it has spread to her brain."

“The doctors don’t think she will improve. What can you do?" Jackie said. "They have done everything; she even entered an experiment. I would like to bring her home.”

More On This...

 “Sly is in Europe. My grandson [Filiti’s son Edmund] says Sylvester has been very helpful to him," she added. "Sylvester has been his morale booster.”

Go to The Post for more on Filiti's condition.