I am sorry to hear about your sister. My own sister had stage 2 cancer. She is a survivor for 3 years now.
Both my parents died of lung cancer as well. Everyone else but me in my family smoked, and they are all dead. My brother was 51 when he died of a massive heart attack. My father was 72 when he died in 1978. My mother and sister were 69. My oldest sister was 74. She was the last to die. I was the baby, and will be 74 soon.