I got it to work, but then I started writing again . I can't figure out why I'm getting this error. It's calling for a declaration where I thought I had already declared things....

107 expected declaration before '}' token

[Build Error] [Merger.1.o] Error 1

The code is mostly the same, except I hadn't ended the while loop in the main function. So when I added a braket to close that loop, I got this pretty little error.

#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string> 
using namespace std;

#define theAdopted "The Adopted.txt"            //His family
#define theOriginals "The Originals.txt"        //Her family
#define theBigPicture "The Big Picture.txt"     //Our family

//Function Prototypes

class KeepRunning {                            //Prototype needed to keep console from closing.
  public:
    ~KeepRunning() {
      cin.get();}};

//Copies text
int copyLine(ifstream&, ifstream&, ofstream&);

int main()                                                                  
{   
    KeepRunning kr;  
     
    ifstream hisFamily("The Adopted.txt");
    ifstream herFamily("The Originals.txt");
    ofstream ourFamily("The Big Picture.txt");
    
    int SIZE1 = 200, SIZE2 = 200;  
    int insA[SIZE1]; 
    int insB[SIZE2];
    int outs[SIZE1 + SIZE2];
    int lineCount;
    int index1 = 0; 
    int index2 = 0;
    int A = 0;
    int B = 0;
    
    //Retreive his family's grades.
    hisFamily;
    if(hisFamily.fail())
    {
        cerr << "ERROR: Cannot open " << theAdopted << ". \n";
        return EXIT_FAILURE;
    } 
    //Retreive her family's grades.
    herFamily;
    if(herFamily.fail())
    {
        cerr << "ERROR: Cannot open " << theOriginals << ". \n";
        return EXIT_FAILURE;
    }
    //Call theBigPicture.
    ourFamily;
    if(ourFamily.fail())
    {
        cerr << "ERROR: Cannot open " << theBigPicture << ". \n";
        return EXIT_FAILURE;
    }        
    //Copy data hisFamily to ourFamily.
    string line;
    lineCount = 0;
    getline(hisFamily, line);
    while(line.length() != 0)
    {
        lineCount++;
        ourFamily << line << endl;
        getline(hisFamily,line); 
    } 
    
    cout << "Input data mergered to file 'The Big Picture.exe'." << endl;
    //Close files.
    hisFamily.close();
    herFamily.close();
    ourFamily.close();
    return 0;
}  
int copyLine
    (ifstream& hisFamily,
     ifstream& herFamily,
     ofstream& ourFamily)
     {
         const char NWLN = '\n';
         char nextCh;
         int charCount = 0;
         
         //Merge
         hisFamily.get(nextCh);
         while ((nextCh != NWLN) && !hisFamily.eof())
         {
             ourFamily.put(nextCh);
             charCount++;
             hisFamily.ignore(nextCh);
             hisFamily.get (nextCh);
         }
         if(!hisFamily.eof())
         {
             ourFamily.put(NWLN);
             charCount++;
         }
         return charCount;
     }
}

Wow disregard that....I had an extra bracket