sisarusten

Sisarusten is a Finnish grammatical form used to indicate possession or association by multiple siblings. It functions as the genitive plural of the noun sisarus, which denotes a sibling (a brother or sister) in a gender-neutral sense. The basic plural form sisarukset means “the siblings,” while sisarusten marks “the siblings’” or “of the siblings.”

In practical usage, sisarusten appears before a noun to show that something belongs to or relates to several siblings. Examples include phrases like sisarusten huone (the siblings’ room) or sisarusten yhteinen projekti (the siblings’ joint project). The form is common in written Finnish, genealogical contexts, and formal or regional speech, though everyday conversation more often refers to individuals as sisko or veli and to groups with possessive forms such as siskojen tai veljien kanssa (together with the sisters or brothers).

The term is typically not a distinct concept on its own beyond its grammatical role; rather, it is a standard inflected form used to express familial relationships among a group of siblings. As such, it can appear in family narratives, historical records, and descriptive writing about family dynamics. In everyday language, speakers may also use the more general plural possessive constructions for mixed groups of siblings or refer to siblings by individual relations when clarity is needed.