full sibling
Shares both parents
A full sibling is a brother or sister who shares both biological parents with you, as distinguished from a half sibling, who shares only one parent.
The term appears mainly in legal, medical, and genealogical contexts where the distinction matters: Full siblings have a 25% chance of being a match for organ donation.
Male with shared parents
- sisterFemale sibling
- kinBlood-connected people
- blood relativeFamily by biological descent
- flesh and bloodOne's close relatives
littermate · kinfolk · next of kin · nuclear family · immediate family
Gene-bearing nuclear structures
- heredityGenetic trait transmission
- genesUnits of heredity
- genotypeOrganism's complete allele set
- alleleGene variant at one locus
homologous · inheritance · zygosity · recessive · dominant · consanguinity
Ongoing contest between opponents
- loyaltyFaithful commitment to another
- camaraderieGoodwill among companions
- supportTo uphold or sustain
- connectionA joining or relation
attachment · intimacy · trust · companionship · closeness · affinity · childhood memories · shared history
First child born
- middle childSibling between oldest and youngest
- youngestLeast old
- big brotherOlder male sibling
- big sisterOlder female sibling
little brother · little sister · elder · junior · age gap · spacing
brother
Male with shared parents
- sisterFemale sibling
- kinBlood-connected people
- blood relativeFamily by biological descent
flesh and blood · littermate · kinfolk · next of kin · nuclear family · immediate family
chromosomes
Gene-bearing nuclear structures
allele · homologous · inheritance · zygosity · recessive · dominant · consanguinity
rivalry
Ongoing contest between opponents
- loyaltyFaithful commitment to another
- camaraderieGoodwill among companions
- supportTo uphold or sustain
connection · attachment · intimacy · trust · companionship · closeness · affinity · childhood memories · shared history · protectiveness
firstborn
First child born
- middle childSibling between oldest and youngest
- youngestLeast old
- big brotherOlder male sibling
big sister · little brother · little sister · elder · junior · age gap · spacing
full siblinghalf-sibling
Child sharing one parent
half-brother · half-sister · step-sibling · stepbrother · stepsister
full siblingadoptive sibling
Family through legal placement
adopted brother · stepsibling · stepbrother · stepsister · adopted sibling