Setting Picklist values dependency using metadata api

I have created two picklist values using metadata api and able to insert the values in the both the picklists, but I have to set the dependency between them, like one is controlling and other would be dependent. I don't want to do it manually.

Here is the code which is working fine to update the picklist values in the picklist fields. But having two issues.

1. It is setting all the values inactive except the last one though I am setting isActive=TRUE for all the values.

2. Not found anything to set the controlling and dependent picklist values.

   MetadataService.ValueSet picklistValueSet = new 
   MetadataService.ValueSet();
   MetadataService.ValueSetValuesDefinition valueDefinition = new 
   MetadataService.ValueSetValuesDefinition();
   List<MetadataService.CustomValue> values = new 
   List<MetadataService.CustomValue>();
   MetadataService.CustomValue customValue1 = new 
   MetadataService.CustomValue();
   
   customValue1.fullName = picklistValueFullname ;  // inserting from csv
   customValue1.isActive = TRUE;
   customValue1.default_x = FALSE;
   customValue1.label = picklistValueLabel; // inserting it from csv
   values.add(customValue1);
   
   valueDefinition.value = values;
   valueDefinition.sorted = false;
   
   picklistValueSet.valueSetDefinition = valueDefinition;
   
   customField.valueSet = picklistValueSet;
   
   List<MetadataService.SaveResult> results = service.createMetadata(new 
   MetadataService.Metadata[] { customField });        
   handleSaveResults(results[0]);