The Requirement is a Database to record any significant event in a child's life
The Scope is defined in the UK Sunday Times, for 25th. July 2004 :-

Home Address
Families (Parents divorced/separated)
Relatives (any alcoholics or Abusers)
School Achievements
Doctor and Hospital Visits
 Police and Social Service Records

B. Things of Interest :-
B.1 Children
B.2 Associates,(Parents,Relatives, etc.) 
B.3 Factors of Associates,(eg Alcoholic, Abuser).
B.4 Events
B.5 Organisations

C. How are they related ?
C.1 A Child can have zero,one, or many known Parents.