Stage 4 NSCLC lung cancer

My mom is 70 years old and found NSCLC lung cancer recently. It spread to brain, liver, multiple bones already. She starts radiotherepy on brain and spine and her Dr. suggest to start Chemo. soon. I would really appreciate any advice if you or youre relatives have the same illness as my mom. I would really appreciate if you can share your experience with me. Any advice with regards to the treament that you may have. What chemo. could be used and how often?

Thanks in advance!

Macy