BackgroundIllness in a child with cardiac disease causes stress, brings additional responsibilities, reorganizes family life, and changes the functioning of the family.AimThis study aimed to validate a new questionnaire evaluating the life situations of caregivers/parents of children with congenital heart disease (CHD) and/or other cardiac diseases (OCD).Materials and methodsThe questionnaire comprised 10 questions aimed at assessing the life situation of an ill child’s caregiver in two main areas: personal and spiritual. The total score of the questionnaire assessing the life situation of the caregiver of a child with a CHD and/or OCD can range from 0 to 32 points, with scores <26 indicating a poor, 25 to 32 indicating an average, and >32 indicating a good level of life situation in the personal sphere of the caregiver. The questionnaire was assessed using Cronbach’s alpha tests, and repeatability was assessed using Cohen’s Kappa test (retest) within a time interval of two to 4  weeks from the first measurement.ResultsThe research covered 50 respondents. Cohesion in the personal sphere obtained a satisfactory value of Cronbach’sα= 0.72, in the spiritual sphere: Cronbach’sα= 0.83, and the result common for both sections was: Cronbach’sα= 0.66.ConclusionThe Life Situation Assessment Questionnaire for caregivers of children with CHD and OCD is a reliable and homogeneous tool for measuring the functioning of parents in the event of a child’s illness.