function drawTree(person, isPartner, yLevel)
	{

		//console.log("drawing: " + person.getName());
		ctx.save();

		person.draw(ctx , xcoord , yLevel * 200);

		xcoord += 135;

		ctx.restore();

		//check the relationship for other partners, then draw them

		if (person.numPartners() > 0 && isPartner == false)
		{

			if( person.getPartner(0).numChilds() > 0)
			{
				for( var i = 0 ; i < person.getPartner(0).numChilds() ; i++)
				{
					drawTree(person.getPartner(0).getChild(i), false, yLevel + 1);

				}
			}

			for ( var i = 0 ; i <= person.numPartners() -1 ; i++)
			{
				drawTree(person.getPartner(i).getPartner(1), true, yLevel);
			}
		}
	}