tytönsä
Tytönsä is a Finnish possessive construction that translates to “his/her daughter.” It is not a standalone root word but a grammatical form built from the noun tyttö (girl) in the genitive form tytön, combined with the third-person possessive suffix sä. The result is a single word, tytönsä, that indicates ownership by a third-party subject.
In Finnish, possession of a noun can be expressed by attaching a possessive suffix to the noun
Työnsä/tytönsä construction appears in both written and spoken Finnish to denote “her/his daughter” in a compact
Hänen tyttönsä asuu kaupungissa. (Her daughter lives in the city.)
Vierasäntä kertoi tyttönsä tarinan. (The guest told the story of his/her daughter.)
Finnish grammar, Genitive case, Possessive suffix in Finnish.