The secret
It's a roller coaste coming-of-age story. Focus is on the three kids thrown into extraordinary circumstances, which brings out best and worst in their relationship to themselves, each other, death and having to be/become an adult. Mum's corpse only appears briefly in the first episode, and the morbid aspects of the story are undertoned in relationship to the subtle humor.
Starring August Igor Svideniouk Egholm, Marta Holm Peschcke-Køedt, Nanna Finding Koppel, Bjarne Henriksen, Claus Riis Østergaard, Keld Heick
Watch "The secret" on Filmstriben released in 2012. It's a drama movie, and has a rating of 6.8 out of 10 from Imdb which is usually fine for this kind of movie, and is currently available to watch for free.