function AddRelative($firstname, $lastname, $nickname, $email, $inviteeEmail)
 {
     include_once '../config/Config.php';
     $conn = new DatabaseConnect();
     $mysqli = $conn->connect($db_host, $db_username, $db_password, $mysql_db);
     //check valid email address
     if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
         echo "Please enter a valid email address";
         die;
     } else {
         $queryEmReg = "SELECT * FROM parents WHERE email ='" . $email . "'";
         $emailCheck = $mysqli->query($queryEmReg);
         if (!mysqli_num_rows($emailCheck) < 1) {
             echo 'Email address in use';
         } else {
             $sql = "INSERT INTO parents (FirstName, LastName, NickName, Email)\n\t\t\t\t\t\tVALUES (?,?,?,?)";
             $sqlFam = "INSERT INTO Families (Parent2)\n\t\t\t\t\t\t\tVALUES (?,?,?,?)";
             $mail = new Parents();
             //prepared query statements
             if ($stmt = $mysqli->prepare($sql)) {
                 $stmt->bind_param("ssss", $firstname, $lastname, $nickname, $email);
                 $stmt->execute();
                 $stmt->bind_result($result);
                 if ($stmt->affected_rows > 0 && scrollParents($email, $inviteeEmail)) {
                     echo 'Email sent';
                     $mail->RelativeVerification($email, $firstname);
                 } else {
                     echo 'Error - could not register';
                 }
                 $stmt->close();
             } else {
                 echo 'Failed query';
             }
         }
     }
     $connect->close();
 }