The goal of this thesis is to analyse adult characters in three novels written by Nada Mihelčić. In this thesis we are working with "Schoolgirl's notes" (2005), "The green dog" (2009) and "Dear mum" (2015). The three novels deal with taboo subjects that are now mostly common in children and adolescent literature, and as such are being dealt with in detail at the beginning considering they are of most importance for the thesis theme. Special attention is being drawn to death, drug abuse and divorce that are being mentioned in said novels. Noticeably, we see a lot more difficult subjects being addressed throughout the last few decades. In the middle part of the thesis, the three said novels are to be analysed on the basis of drawing characters and situations in each particular novel with the attention paid to retrospect and chronology. Following that, adult characters are to be studied throughout their traditional, democratic and liberal views. Special attention is to be paid on upbringing styles of adult characters, and their communication skills, verbal and non verbal. As for the analyzed novels which have more or less the presence of the adult characters the classification is stated by the criteria of complexity and importance for the novels' story where the significance of the adult characters that play a part in the main charachter's life is presented. Analysis of all adult characters are backed up by quotes and at the end of the thesis there needs to be a conclusion in which there is a discussion of how Nada Mihelčić's work affected modern children and adolescent literature and the importance of studying adult characters closely as unavoidable part of modern family novel.