Blood relatives refer to relatives that share a biological connection. However, there are various synonyms that can be used to refer to such relatives. For instance, one can describe them as kith and kin, family members, or kinfolk. These words are often used interchangeably and can refer to individuals related by blood, marriage, or adoption. Additionally, one can use the term next of kin to describe immediate family, such as spouses, children, and parents. The term lineage can also be used to describe a family's line of descent. While these terms may vary slightly in meaning, they all hint at a common thread of family relationships.