Jill and Joy (both 9) live in their own house like any other little girls, except that they might be a little happier than most little girls, as they get to live in their own house specifically designed for the two. One December evening a small car, barely the size of a shoebox, pulls up in front their house, and a teensy-weensy family gets out; it's the McTiny family. The family has become homeless after a road roller smashed their home. Planning to live with the girls temporarily, the family moves in with Jill and Joy but soon finds out that not all big people have good intentions towards them. Jill and Joy's Winter is based on a beloved book by the same name, written by a Finnish writer named Marjatta Kurenniemi.

Lilja Lehto
as Anneli

Aava Merikanto
as Onneli

Anna-Leena Sipilä
as Ms. Vaaksanheimo

Joonas Saartamo
as Mr. Vaaksanheimo

Leena Uotila
as Grandma Vaaksanheimo

Aleksis Koistinen
as Putti

Lydia Ristisuo
as Lilli

Jaakko Saariluoma
as Urho Ulpukka

Johanna af Schultén
as Mrs. Rosina

Eija Ahvo
as Mrs. Ruusupuu