My family and me ()

Thanassakis, a 13-year-old boy, is staying with his grandparents in the Greek village of Ano Ravenia, while his parents stay with his younger brother in Zurich, Switzerland. It was filmed during three periods: winter in the village, summer in the village (while his parents, as most migrants, come back for the holidays), and Christmas in Zurich when the grandfather and the young boy visit their family. Who is most important to the young boy - his father or grandfather?