noun
ADJECTIVE
▪ elder , eldest , older , younger
▪
The younger children were badly treated by older ~s.
▪ adoptive
▪ female , male
SIBLING + NOUN
▪ rivalry
▪ relationship
▪
Anna and Elena have a fairly typical ~ relationship.
PREPOSITION
▪ among ~s , between ~s
▪
poor relationships between ~s
Sibling is used before these nouns: ↑ rivalry