What happens to the children when there parents die?

United States & Canada

The court must appoint a guardian.

UK

okay usually grandparents or aunts and uncles will take the child or children in and raise them however if there isn't any immediate family ie i have known godparents to take them in sometimes parents make a will and they state who they would want to be their childrens guardians if something should ever happen to them.

Alternate:

foster care until a family comes along and wishes to adopt now a days there are CRB checks etc

NB: being a god parent doesn't necessarily make you a guardian unless you have been nominated in the childrens parents will