A person’s parent, sibling, or child.
More example sentences
- One of the three relatives is a first-degree relative of the other two, such as a parent, child or sibling
- None of her other first-degree relatives had been affected by breast, ovarian or colon cancer, which greatly decreased the chances that she carried a gene mutation predisposing her to breast cancer.
- Although anyone with first-degree relatives who have had breast cancer is at increased risk, most people don't get the inherited kind of breast cancer.
Definition of first-degree relative in:
- The British & World English dictionary