The aim of this study was to examine how well parents assess their child's mental state in terms of parental emotional regulation, parental stress and children's experience of anxiety and stress in the context of a coronavirus pandemic. The research was conducted in two stages. In the first stage, online questionnaire for children was filled out by students in the upper grades of primary school, and in the second stage of the research, the questionnaire for parents was filled out by students' parents. A total of 300 respondents, that is 150 parent-child dyads, participated in the research. Mothers (83.3%) approached the survey more than fathers (16.7%), but also female students (58%) more than male students (42%). The age of the parents ranged from 34 to 64 years (M = 45.51; SD = 4.85), and the age of the children from 11 to 15 years (M = 12.65; SD = 1.19). Correlation analyzes and hierarchical regression analyzes were performed to check the relationships between the variables - parental emotional regulation, parental stress, parental assessment of the child 's mental state, children' s stress and anxiety. The obtained results indicate the connection between parental and child stress and between the parental perception of child's mental state and the child's experience of anxiety and stress. Furthermore, the gender of the child has been shown to be a significant predictor of child anxiety, and significant predictors of child stress were the child's gender, parental orientation to the child's emotions and parental stress. Significant predictors of parental perception of children's mental state are negative parental emotions, parental stress, and children's anxiety and stress. In conclusion, it can be said that parents assess the deterioration in the mental state of their children during the coronavirus pandemic and that poor mental state of children is associated with parental stress and parental experience of negative emotions.