Final answer:
In some cases, parents are unable to care for their children due to various reasons such as mental health issues, drug use, incarceration, abuse or abandonment. In such situations, children may live with grandparents or other relatives. Child welfare departments may also be involved in providing care for the children.
Step-by-step explanation:
In some cases, parents can no longer care for their children. The causes range from parental mental health issues, drug use, or incarceration, as well as physical or sexual abuse of the children or abandonment by the parent.
About half of these children live with grandparents, and about 20 percent live with other relatives. Sometimes a grandparent or other relative temporarily assumes care of children, while other times the arrangement is longer term and the state or city child welfare department is involved.