class.cs

public abstract class Vertex
{
    public abstract string Label { get; }
}

public class Person : Vertex
{
    public override string Label => "Person";
    public Guid Id { get; set; }
    public string FirstName { get; set; }
    public string partitionKey => FirstName.Substring(0, 1);
}

public abstract class Edge
{
    public Guid Id { get; set; }
    public abstract string Label { get; }
}

public class SiblingOf : Edge
{
    public override string Label => "Sibling Of";
}

public class ChildOf : Edge 
{
    public override string Label => "Child Of";
}

public class MarriedTo : Edge
{
    public override string Label => "Married To";
}