/ˈlaɪniəl rɪˈleɪʃən/ – Phrase
Definition: quan hệ họ hàng theo trực hệ.
A more thorough explanation: Lineal relation refers to a direct relationship between individuals who are related by blood, such as parents and children, grandparents and grandchildren, or siblings. This term is often used in legal contexts to describe the direct lineage or descent between family members.
Example: The lineal relation between the deceased and the claimant was established through a series of birth certificates and family records.