datarelation - three tables

Hello :) I have this code:

 SqlConnection conn = new SqlConnection();
 conn.ConnectionString = "..";
 conn.Open();
SqlDataAdapter dataAdapter1 = new SqlDataAdapter("SELECT * FROM adresa JOIN client ON adresa.cod_adresa=client.cod_adresa  JOIN utilizator ON client.id_client=utilizator.id_client", conn);
DataSet dataSet=new DataSet();
dataAdapter1.Fill(dataSet, "client");
clientBS.DataSource = dataSet.Tables["client"]; //+utilizator&adresa
 clientGridView.DataSource = clientBS;

i know that i have to use datarelation , but i don't know how. any help?