diff --git a/src/tft.cpp b/src/tft.cpp
index d0f280e..c3de9a2 100644
--- a/src/tft.cpp
+++ b/src/tft.cpp
@@ -32,7 +32,9 @@ int main(int argc, char* argv[])
 	}
 
 	init_ncurses();
-	displayTree(tree);
+
+	if( !tree.isEmpty() )
+		displayTree(tree);
 
 	return 0;
 }
diff --git a/src/tree.cpp b/src/tree.cpp
index e752986..f02b3a8 100644
--- a/src/tree.cpp
+++ b/src/tree.cpp
@@ -1,8 +1,10 @@
-#include"tree.hpp"
-#include"utils.hpp"
+#include <assert.h>
 #include <iostream>
 #include <fstream>
-#include <assert.h>
+#include <algorithm>
+
+#include"tree.hpp"
+#include"utils.hpp"
 
 using std::vector;
 using std::string;
@@ -37,28 +39,40 @@ Tree& Tree::operator+=(const Tree& other)
 	people_.reserve(idCounter);
 	for (person_id i = 0; i < other.people_.size(); ++i) /* add the personal data of II to I */
 	{
-		if (newId[i] >= initNum) /* isnt already in I */
+		if (newId[i] >= initNum) /* isnt present in I */
 			people_.push_back(other.people_[i]);
 	}
 
 	relations_.reserve(idCounter);
-	for (person_id i = 0; i < other.people_.size(); ++i)	 //merge the relative data
+	for (person_id idIn2 = 0; idIn2 < other.people_.size(); ++idIn2)	 // merge the relational data
 	{
-		if (newId[i] >= initNum) /* isnt already in I */
+		if (newId[idIn2] >= initNum) /* isnt present in I */
 		{
-			relations_.push_back(other.relations_[i]);
+			relations_.push_back(other.relations_[idIn2]);
 			for (Relation& rel: relations_.back())
 				rel.id = newId[rel.id];
 		}
-		else   //if present in both trees
+		else   // if present in both trees
 		{
-			person_id idIn1 = newId[i];
-			relations_[idIn1].reserve(relations_[idIn1].size() + other.relations_[i].size());
+			person_id idIn1 = newId[idIn2];
+			std::vector<Relation>& relsIn1 = relations_[idIn1];
+			relsIn1.reserve(relsIn1.size() + other.relations_[idIn2].size());
 
-			for (Relation rel: other.relations_[i])
+			for (Relation relIn2: other.relations_[idIn2])
 			{
-				if(newId[rel.id] >= initNum) /* not already in I */
-					relations_[idIn1].push_back( {newId[rel.id], rel.type} );
+				if(newId[relIn2.id] >= initNum) /* relative not present in I */
+					relsIn1.push_back( {newId[relIn2.id], relIn2.type} );
+
+				else
+				{
+					bool foundIn1 = false;
+					for(Relation relIn1: relsIn1)
+						if(relIn1.id == newId[relIn2.id])
+							foundIn1 = true;
+
+					if( !foundIn1 ) // relative is present in I, but relation only in II
+						relsIn1.push_back( {newId[relIn2.id], relIn2.type} );
+				}
 			}
 
 		}
@@ -529,13 +543,13 @@ I16 Tree::drawLineWithWives(const person_id id, I16 drawY, const I16 drawX) cons
 	}
 	const size_t numKids = children.size();
 	U16 person_w = person.draw(drawY, drawX,
-							   id == selected_, spouse!=Nobody, true, numKids!=0, zoom_==1);
+				   id == selected_, spouse!=Nobody, true, numKids!=0, zoom_==1);
 
 	U16 spouse_w = 0;
 	if (spouse != Nobody)
 	{
 		U16 spouse_box = people_[spouse].draw(drawY, drawX + person_w + spouse_dist_,
-											 spouse == selected_, false, false, false, zoom_==1);
+						      spouse == selected_, false, false, false, zoom_==1);
 		spouse_w = spouse_dist_ + spouse_box;
 	}
 
diff --git a/src/tree.hpp b/src/tree.hpp
index 43ae7a7..62d1396 100644
--- a/src/tree.hpp
+++ b/src/tree.hpp
@@ -96,7 +96,7 @@ private:
 
 	// 0 is the first person in the tree
 	person_id focused_ = 0;			/* the tree was draw based on this person */
-	person_id selected_ = 0;
+	person_id selected_;
 	U8 zoom_ = 0;
 
 	// todo: figure out what to do with these constants
diff --git a/src/ui.cpp b/src/ui.cpp
index 6840604..7acd971 100644
--- a/src/ui.cpp
+++ b/src/ui.cpp
@@ -16,8 +16,6 @@ namespace
 
 void displayTree(Tree& t)
 {
-	// checck there are people
-
 	person_id selected = 0;	// the currently selected selected
 	U8 zoom = 0;		// how much info to show for each selected
 
diff --git a/todo.txt b/todo.txt
index a1c233c..15d10ce 100644
--- a/todo.txt
+++ b/todo.txt
@@ -11,7 +11,7 @@ types - screenCoord...
 Visualization:
 - zooming
 - snap to selection/scroll with selection
-- horizontal navigation between cousins - finish
+- horizontal navigation between cousins
 - color on different consoles
 - screen resize
 - empty tree
@@ -33,7 +33,8 @@ Compilation
 Refactoring
 - comment style /*
 - check return codes - setlocale,
-- focused -> root ?
+- focused -> root
+- tree::relations_ to std::set
 
 test
 - no Adam