Discussing death with preschooler

I need help, guidance or something...My son is 3.5. Very smart, extremely verbal, but I don’t know how to discuss death with him and feel like the time has come for us to start preparing him.Earlier this year, my mother was admitted to the hospital. She was there for about a week before discharged and was sent home on oxygen. She lives about 6 hours away and I went to be with her, explaining to son that Yaya was sick and the doctors were going to help her feel better. He understood and asks every time they talk if she is feeling better. She hasn’t needed the oxygen in front of him yet.She has been having various testing done over the past few months and was officially diagnosed on Thursday. She has pulmonary hypertension, group 3. 3 and 4 are the high risk categories and have a life expectancy of 1-5 years after diagnosis. The longer expectancy is dependent on being under the care of a knowledgeable doctor and exercise. She lives in a small community and the doctor she has does not have experience with this disease. There is a specialist coming in from Dallas once a month to treat my mom and another patient. Due to chronic pain, she will not be exercising and she is still struggling to stop smoking.I am overwhelmed. I’m struggling under the weight of this information. My mom and I had a broken relationship until my son was about 6 months old and we’ve been pretty close ever since. She is very close to my son but, because she’s been so sick this year, she hasn’t been able to come visit us. We visited once during the summer and plan to schedule more trips on long weekends. With the exception of my stepmom, my mom is the youngest of all our parents. I just -I’m struggling to process.How do I prepare him? Do I or do I just let him ask questions when he sees her? We are not religious, though we both grew up that way, so I have no idea how to discuss death with him. I get so sad thinking about her passing and then just collapse under the thought of how he is going to react. I don’t even know what to do... via /r/Parenting https://ift.tt/2D0Qmd8