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Type of study: The goal of this observational study is to explore the relationship between patients with advanced lung cancer and their parent-child interactions during the treatment process, and to understand the impact of the degree of self-differentiation of parents with advanced lung cancer on the physical and mental health of their children. The main questions it aims to answer are:

1. To explore the post-illness adjustment process of patients with advanced lung cancer and the changes in the parent-child relationship among adolescents.
2. To explore the changes in demographic factors-self-belief, mental health, and self-efficacy among patients with advanced lung cancer-and the parent-child relationship among adolescents.
3. Explore the family resilience of patients with advanced lung cancer - family peer relationships, and the interaction between parent-child relationships among adolescents.

This study explores the relationship between late-stage lung cancer patients and their parent-child interactions during the treatment process, and understands the impact of the degree of self-differentiation of parents with late-stage lung cancer on their children's physical and mental health.

Inclusion Criteria:

1. Patients with advanced lung cancer aged 40 to 64 years (mid-adulthood).
2. There are lung cancer patients in the family who are teenagers aged 10 to 19 years old.
3. Those who voluntarily participate in this study.
4. Voluntary participants can express themselves orally and in handwriting.

Exclusion Criteria:

1. Single lung cancer patients over 65 years old.
2. Lung cancer patients under 40 years old.
3. Patients diagnosed with early-stage lung cancer.
4. Those who have cognitive impairment and are unable to understand the problem.
5. Those who are unable to express and respond to questions.

Patients with advanced lung cancer aged 40 to 64 years, and have aged 10 to 19 years old teenagers.