perheenjäseniin
Perheenjäseniin is a Finnish grammatical form meaning “to the family members” or “into the family members.” It is the illative plural form of perheenjäsen, which itself means a member of a family. The illative case denotes direction toward something or into a location, so perheenjäseniin is used when the action is directed at the family members as a group or when describing movement toward them in a sentence.
Morphology and related forms help clarify its use. The base noun is perheenjäsen (family member). In the
Usage considerations are important. The illative plural is a specific, sometimes formal, way to indicate direction
In summary, perheenjäseniin is the illative plural form of perheenjäsen, used to express direction toward the