类的继承错误 初学 请多指教

//person是student，teacher的基类。而teacher_student又是student和teacher的子类。
//并且继承之间都是pubilc 且无虚继承。
//错误发生在 Teacher_student类的writein_tofile()函数的第三行"out<<name<<" "<<sex<<" "<<age<<" "<<IDstudent<<" "<<IDclass<<" "<<IDteacher<<'\n';"
// error C2385: 对“name”的访问不明确
// 1>        可能是“name”(位于基“Person”中)
// 1>        也可能是“name”(位于基“Person”中)
//error C2385: 对“sex”的访问不明确
// 1>        可能是“sex”(位于基“Person”中)
// 1>        也可能是“sex”(位于基“Person”中)
// error C2385: 对“age”的访问不明确
// 1>        可能是“age”(位于基“Person”中)
// 1>        也可能是“age”(位于基“Person”中)
//

#include <fstream>
#include <iostream>
#include <string>
class Person
{
public:
    Person();
    Person(std::string thename,char thesex,int theage);
    virtual void writein_tofile();

protected:
    std::string name;
    char sex;
    int age;
};


//function of class person
Person::Person()
{

}
Person::Person(std::string thename,char thesex,int theage)
{
    name=thename;
    sex=thesex;
    age=theage;
}



void Person::writein_tofile()
{
    std::ofstream out;
    out.open("person.txt",std::ofstream::out|std::ofstream::app);
    out<<name<<" "<<sex<<" "<<age<<'\n';
    out.close();

}






 class Student: public Person

 {

 public:
     Student();
     Student(std::string thename, char thesex,int theage,std::string theIDstudent);
     void writein_tofile();

 protected:
     std::string IDstudent;

 };

 

 Student::Student()

 {
    ;

 }

 Student::Student(std::string thename, char thesex,int theage,std::string theIDstudent):Person(thename, thesex,theage)//在构造函数的
{
     
     IDstudent=theIDstudent;

 }


 void Student::writein_tofile()

 {
     std::ofstream out;
     out.open("student.txt",std::ofstream::out|std::ofstream::app);
     out<<name<<" "<<sex<<" "<<age<<" "<<IDstudent<<'\n';
     out.close();

 }

 

 

 class Teacher: public Person
  {
  public:
     Teacher();
      Teacher(std::string thename, char thesex,int theage,std::string theIDteacher);
      void writein_tofile();
  protected:
      std::string IDteacher;
  };
//function of class Teacher
Teacher::Teacher()

 {
    ;

 }

 Teacher::Teacher(std::string thename, char thesex,int theage,std::string theIDteacher):Person(thename,thesex,theage)

 {
     IDteacher=theIDteacher;

 }

 void Teacher::writein_tofile()

 {
     std::ofstream out;
     out.open("teacher.txt",std::ofstream::out|std::ofstream::app);
     out<<name<<" "<<sex<<" "<<age<<" "<<IDteacher<<'\n';
     out.close();

 }

 

 

 class Teacher_student: public Student,public Teacher

 {

 public:
     Teacher_student();
     Teacher_student(std::string thename, char thesex,int theage,std::string theIDstudent,std::string theIDclass,std::string theIDteacher);
     void writein_tofile();

 protected:
     std::string IDclass;

 };



 //function of class Teacher_student
Teacher_student::Teacher_student()

 {
    ;

 }

 Teacher_student::Teacher_student(std::string thename, char thesex,int theage,std::string theIDstudent,std::string theIDclass,std::string theIDteacher)
:Student(thename, thesex,theage,theIDstudent),Teacher(thename, thesex,theage,theIDteacher)

 {
     IDclass=theIDclass;

 }
void Teacher_student::writein_tofile()

 {
     std::ofstream out;
     out.open("teather_student.txt",std::ofstream::out|std::ofstream::app);
     out<<name<<" "<<sex<<" "<<age<<" "<<IDstudent<<" "<<IDclass<<" "<<IDteacher<<'\n';
     out.close();

 }

 void readout_file(const char* file)

 {
     std::ifstream in;
     in.open(file,std::ifstream::in);
     std::string str;
     while (getline(in,str))
     {
         std::cout<<str<<'\n';
     }
     in.close();

 }