step-sibling
Parent's spouse's child
A step-sibling is the child of one's stepparent from a previous relationship—someone who becomes your sibling through marriage rather than shared biological parents.
Distinguished from half-siblings, who share one biological parent: My dad remarried when I was twelve, and I gained two step-siblings overnight.
Father's spouse, not birth mother
- stepparentSpouse's prior child's caregiver
- stepfamilyHousehold joined by remarriage
- co-parentingJoint child-rearing by separated adults
- householdDomestic unit of residents
remarriage · integration · bonding · adjustment · harmony · unity · acceptance · domesticity
Male sharing one parent
- half-sisterFemale sibling, one shared parent
- kinBlood-connected people
- relativesThose connected by blood
- nephewSibling's male offspring
Ongoing contest between opponents
- bondingForming close connections
- jealousyResentful desire for another's advantages
- companionshipState of having company
- adjustmentAlteration to improve fit
acceptance · conflict · alliance · camaraderie · resentment · loyalty · affection · estrangement
stepmother
Father's spouse, not birth mother
- stepparentSpouse's prior child's caregiver
- stepfamilyHousehold joined by remarriage
- co-parentingJoint child-rearing by separated adults
household · remarriage · integration · bonding · adjustment · harmony · unity · acceptance · domesticity · merger
half-brother
Male sharing one parent
- half-sisterFemale sibling, one shared parent
- kinBlood-connected people
- relativesThose connected by blood
rivalry
Ongoing contest between opponents
- bondingForming close connections
- jealousyResentful desire for another's advantages
- companionshipState of having company
adjustment · acceptance · conflict · alliance · camaraderie · resentment · loyalty · affection · estrangement · reconciliation
stepmother
Father's spouse, not birth mother
- stepparentSpouse's prior child's caregiver
- stepdaughterSpouse's child by another
- stepsonMale child by marriage
adoptive · foster · unrelated · guardian · godparent · godchild · ward · custodian
step-siblingblood sibling
Genetically related brother/sister
full sibling · blood relative · twin · blood brother · blood sister
step-siblingonly child
Person without siblings
stranger · non-relative · single child · single · alone