How to comparatively parse through objects inside a dictionary in C# -

so have person class contains info (firstname, lastname, mother, father, siblings, spouse) , want add people of class person dictionary. comparatively parse through dictionary determine relationship of objects (i.e. given person, find cousins, siblings, etc.). question 2 fold: 1) how should set dictionary<...> , 2) how access properties of each person in list? first tried:

dictionary<string, object> dictionary = new dictionary<string, object>();   var human = person.addperson();  // person.addperson() returns new instance of person                                dictionary.add(human.name, human)    // setting key full name, value person object. 

should try dictionary<string, string> <firstname, lastname> , once matches of people same name, start searching dictionary mother, father, etc.??? seems terribly slow , not right way go.
edit: here person class , 1 of other classes (bear in mind i'm setting up, i'll handle user inputs, etc later):

public class person {     public string name { get; set;}     public mother mother { get; set; }      public father father { get; set; }     public spouse spouse { get; set; }     public sibling sibling { get; set; }      //list<sibling> siblings = new list<sibling>();      public person()     { }      public static person addperson()     {         person newperson = new person();         console.writeline("enter name:");         newperson.name = console.readline().trim();         console.writeline("enter mother's name:");         string input = console.readline().trim();         mother mom = new mother(input);         newperson.mother = mom;         console.writeline("enter father's name:");         string input1 = console.readline().trim();         father dad = new father(input1);         newperson.father = dad;         console.writeline("enter sibling's name:");         string input2 = console.readline().trim();         sibling sib = new sibling(input2);         newperson.sibling = sib;         console.writeline("enter spouse's name:");         string input3 = console.readline().trim();         spouse partner = new spouse(input3);         newperson.spouse = partner;          return newperson;     }  }  public class sibling : person {     private string name;     public sibling(string name)     {         name = name;      }     public sibling()     { } }  public class mother : person {     private string name;     public mother(string name)     {                     //mother mom = new mother();         name = name;     }     public mother()     { } }  public class father : person {     private string name;     public father(string name)     {         name = name;      }     public father()     { } }  public class spouse : person {     private string name;     public spouse(string name)     {         name = name;      }     public spouse()     { } }  } 

importantly key of dictionary has unique.

so, if suspect have more 1 person having same first name might not able use first name key.

therefore key either combination of person properties string.concat(firstname, lastname) again assuming combination unique or random number (like guid).

edit:

to printing override tostring, of each class. below example

public class father : person     {         private string name;         public father(string name)         {             name = name;          }         public father()         { }          public override string tostring()         {             return this.name;         }     } 

this should work then:

console.writeline("{0} {1} {2}", person.value.father, person.value.mother, person.value.sibling);