Firebase: How to determine duplicate in different parents

I have the following code to reject duplicates in the "Admin" Firebase:

  public static void checkForDuplicateTweet()
  {
    Query adminQuery = dbRefAdminFeed.orderByChild("tweetStatusID").equalTo(TweetData.tweetStatusID);
    Query feedQuery = dbRefFeed.orderByChild("tweetStatusID").equalTo(TweetData.tweetStatusID);

    adminQuery.addValueEventListener(new ValueEventListener()
    {
      @Override
      public void onDataChange(@NonNull DataSnapshot dataSnapshot)
      {
        if (dataSnapshot.exists())
        {
          boolean isFirst = true;

          for (DataSnapshot postSnapshot : dataSnapshot.getChildren())
          {
            TweetData tweetData = postSnapshot.getValue(TweetData.class);

            if (isFirst)
            {
              isFirst = false;
            }
            else
            {
              removeTweetFromFirebase(Objects.requireNonNull(tweetData).tweetKey);
            }
          }
        }
      }

      @Override
      public void onCancelled(@NonNull DatabaseError databaseError)
      {
      }
    });
  }

How do I check a different parent to see if the tweetStatusID exists under that parent with the following structure?

You're halfway there. To check if the value exists under both parents, you have to run a query on each parent. So just run the query on dbRefFeed, once you've determine that the value exists under dbRefAdminFeed.

Query adminQuery = dbRefAdminFeed.orderByChild("tweetStatusID").equalTo(TweetData.tweetStatusID);
Query feedQuery = dbRefFeed.orderByChild("tweetStatusID").equalTo(TweetData.tweetStatusID);

adminQuery.addValueEventListener(new ValueEventListener() {
  @Override
  public void onDataChange(@NonNull DataSnapshot adminSnapshot) {
    if (adminSnapshot.exists()) {
      feedQuery.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot feedSnapshot) {
          if (feedSnapshot.exists()) {
              ...
          }
        }
    }
  }