* child of father object
*/
public void addChild(final Object fatherObject,
final List<ReferencingReferencedCouple> childList)
throws MemInspectorException {
final ObjectIdentityKey fatherIdentity = new ObjectIdentityKey(
fatherObject);
final NodeForObject fatherNode = nodeForObjectByWeakMap
.get(fatherIdentity);
if (fatherNode == null) {
throw new MemInspectorException("father node must exist");