Tõnu Oja, playing the grandfather, is the real life father of Pääru Oja, playing uncle Kolja.
Although the language that the Tarkkinen family speaks to each other may sound a bit strange to Finnish viewers, it is actually Finnish. It belongs to the Southern-Eastern dialects of Finnish and it is called Ingrian dialect. The dialect is nearly extinct because Ingrian Finns in Russia are heavily Russianized, Ingrian Finns that have moved back to Finland speak some other dialects of Finnish, Ingrian Finns in Estonia speak mostly Estonian, and Ingrian Finns that have moved to Sweden speak Swedish.