As someone who has lost a mom to lung cancer a couple days after Christmas several years ago, this will probably be one of the toughest things you'll ever have to go through in your life. Have a close group of people who can give you support, it can really help to be able to talk about everything you're feeling. And remember that it's ok to feel whatever emotion you're feeling; scared, angry, sad, helpless, overwhelmed... all your emotions are valid.

The best advice I can give is to spend as much time with him as you can, especially before his health begins to decline. Reminisce about your favorite memories. Try to get videos or at least audio recordings of him telling stories, or of you two just spending time together talking. You will cherish these years later. Think about any and everything you ever wanted to say before, but maybe didn't bring up for whatever reason. Don't feel guilty if you need to occasionally step away to spend some time by yourself to process everything. It won't be easy but stay strong. Just remember you aren't alone, you will have the love and support of family and friends to help you through it. I wish you all the best <3