Code

var persons = new[]
{
	new Person { Id = 1, Name = "n1" },
	new Person { Id = 2, Name = "n2" },
	new Person { Id = 3, Name = "n3" },
	new Person { Id = 4, Name = "n4" },
	new Person { Id = 5, Name = "n5" }
};
var relations = new[]
{
	new Relation { P1 = 1, P2 = 3, Type = "father" },
	new Relation { P1 = 2, P2 = 3, Type = "mother" },
	new Relation { P1 = 1, P2 = 2, Type = "spouse" },
	new Relation { P1 = 3, P2 = 5, Type = "father" },
	new Relation { P1 = 4, P2 = 5, Type = "mother" },
	new Relation { P1 = 3, P2 = 4, Type = "spouse" }
};

var map = new Dictionary<int, DiagramNode>();
foreach (var person in persons)
{
	var node = diagram.Factory.CreateShapeNode(0, 0, 30, 20);
	node.Text = person.Name;
	map[person.Id] = node;
}
foreach (var rel in relations)
{
	var link = diagram.Factory.CreateDiagramLink(map[rel.P1], map[rel.P2]);
	link.Text = rel.Type;
}

new LayeredLayout().Arrange(diagram);

class Person
{
	public int Id { get; set; }
	public string Name { get; set; }
}

class Relation
{
	public int P1 { get; set; }
	public int P2 { get; set; }
	public string Type { get; set; }
}