First Degree Relative

Definition 1

Any relative who is one meiosis away from a particular individual in a family; a relative with whom one half of an individual's genes is shared (i.e., parent, sibling, offspring) (from Genetics Home Reference glossary) (NCI Thesaurus)

Definition 2

Any individual related biologically or legally to another individual and considered immediate family as in the case of a spouse, parent, sibling or child. (NCI Thesaurus/CDISC)

Definition 3

The parents, siblings, or children of an individual. (NCI Dictionary)

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