Family assessment is the collection of data about the composition of family and relationship among its members. It is a continuous process of evaluating patterns of interaction between family members relevant to the child health issue. The purpose of comprehensive family functional assessment is to provide the information necessary to determine the functioning of the family and how it contributes to child safety, permanency and wellbeing. The framework of the assessment of children in need and their families provide detailed guidance for gathering and analysing information about all children and their families. The framework refers to three dimensions for the assessment; child developmental needs, parenting capacity and family environmental factors. The features of high-quality assessment ensure equality of opportunity and respect for diversity including family structures, culture, religion and ethnic origin. Family assessment tools can be used to gather additional information about the family’s functioning and can place strengths. Information about family can be illustrated by Genogram, Ecomap of family, Family life line and SCREEM. During the family assessment, the role of nurse is to gather information relating to the child developmental needs, child’s safety, risk of maltreatment, ability to achieve permancy, parental protective capacity, progress toward health and wellbeing and parents’ capacity to respond to those needs. Family assessment is more than simple medical care for a child with health issues. When the nurse meets the family, it is important to investigate how all the members of the family are affected by child health issue.