The admission of an adolescent to a child and adolescent psychiatric inpatient unit has a serious impact on the entire family unit. The emotional experience of those primary caregivers has been scarcely studied qualitatively despite being recommended by previous research. This study aims to examine the experience of parents of adolescents with mental health needs that required psychiatric hospitalization in a child and adolescent unit. Qualitative cross-sectional research was carried out under the recommendations of Grounded Theory with three Focus Groups of parents (N = 22) of adolescents who required psychiatric hospitalization in a child and adolescent ward. The COREQ quality criteria were applied. The parental experience implies a high level of emotional suffering modulated by feelings of guilt, stigma, parental awareness of their child’s illness and the passage of time. The use of Prochaska’s and Diclemente’s trans-theoretical model of health behavior change is useful in understanding the parental experience.