var group_fields = [];
// Loop through the fields
theForm.serializeArray().forEach(function(entry,i) {
  // Get the index and prop name from the entry name
  var nameparts = /^([a-zA-Z0-9_]+)\[(.+)\]\[(.*)\]$/.exec(entry.name);
  // Get the group entry if we already have it
  var group = group_fields[nameparts[2]];
  if (!group) {
    // We don't, create and add it
    group = group_fields[nameparts[2]] = {};
  }
  // Set the property (address, street, etc.)
  group_fields[nameparts[2]][nameparts[3]] = entry.value;
});