I am building a clone opportunity controller which is cloning opportunity, bid__c and and BidAccount__c  a parent, child and grandchild relationship. everything in the code is working fine except the grandchild records BidAccount are getting related to the old Child record ( bid)  I am not sure what I am doing wrong.
Please see the code sample below:
//This class is used to clone the Existing Opportunity and related Bids.

public class CloneOpportunityRebidController
{
   
   

    //added an instance varaible for the standard controller
    private ApexPages.StandardController controller {get; set;}
     // add the instance for the variables being passed by id on the url
    private Opportunity extOpportunity {get;set;}
  
    // set the id of the record that is created
    public ID newRecordId {get;set;}

    // initialize the controller
    public CloneOpportunityRebidController(ApexPages.StandardController controller)
    {
        //initialize the stanrdard controller
        this.controller = controller;
        // load the current record
        extOpportunity = (Opportunity)controller.getRecord();
        
    }

    // method called from the VF's action attribute to clone the Case
    public PageReference cloneOpportunity()
    {
        // setup the save point for rollback
        Savepoint sp = Database.setSavepoint();
        Opportunity newOpportunity;
        List <Bid__c> extBid;
        List <BidAccount__c>extOpportunityBidAccts;
       
        try {
   // Fetch source Opportunity fields to populate(clone)for target Opportunity           
            extOpportunity = [
                select Id,Name,LeadRating__c,OpportunityClassification__c,LeadSource
                    
                from Opportunity
                where id =: extOpportunity.id];
                 
             
            if(extOpportunity != null)
            {
                newOpportunity = extOpportunity.clone(false);
                insert newOpportunity;
                // set the id of the new Opportunity created for testing
                newRecordId = newOpportunity.id;
                   
                //newOpportunity is a copy of the opportunity with bids not copied over and extOpportunity is old opportunity
                // from which we want to copy over the bids
                //Get list of Bids from the old opportunity to populate into the new opportunity
                //extBid= the bid data from collection of Bids where the bids opportunity is equal to
                //existing opportunity

                extBid =  [
                    select ID, Opportunity__c
                    from Bid__c
                    where Opportunity__c =:extOpportunity.id];
               
         
                List<Bid__c> insertextBid = new List <Bid__c>();
               
                //extBid = the bid data from collection of bids where the bid's opportununity equals the existing opportunity
               
               
                if(extBid != null){  // if existing opportunity returned a collection of Bids
                    for(Bid__c extOpportunityBid :extBid) // Every Bid in a collection of Bid is called extOpportunityBid
                    {
                      
                      Bid__c newextOpportunityBid = extOpportunityBid.clone(False); //Made a copy of the Bid
                        newextOpportunityBid.Opportunity__c = newRecordId; 
                      
                        extOpportunityBidAccts = [
                    SELECT Bid__r.Id,Account__c,Bid__c, Bid__r.Name, Bid__r.Opportunity__c,Name
                            from BidAccount__c
                            where Bid__r.Opportunity__c =:extOpportunity.id];
                        List<BidAccount__c>insertBidAccount=new list<BidAccount__c>();
                        if(extOpportunityBidAccts != null) { 
                            for(BidAccount__c extOpportunityBidAccount :extOpportunityBidAccts) // Every Account in a collection of Bid is called extOpportunityBidAccount
                            {
                                
                                BidAccount__c newextOpportunityBidAccount = extOpportunityBidAccount.clone(False); //Made a copy of the BidAccount
                               newextOpportunityBidAccount.Bid__r.Opportunity__c= newRecordId;  
                               
                                InsertBidAccount.add(newextOpportunityBidAccount);
                                 
                            }
                            insert InsertBidAccount;
                           
                       }
                        InsertextBid.add(newextOpportunityBid);
                    }
                    insert InsertextBid;
                }
                //// Insert BidAccounts for every Bid.
    
            }
        } catch (Exception e){
            // roll everything back in case of errors
           
            Database.rollback(sp);
           
            ApexPages.addMessages(e);
           
            return null;
         }

        return new PageReference('/'+newOpportunity.id+'/e?retURL=%2F'+newOpportunity.id);
    }

}