I want to get value from grand parent repeater in child repeater in asp.net

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Repeater1.DataSource = getcontinent();
Repeater1.DataBind();
}
}
private DataTable getcontinent()
{
DataTable dt = u.gtcont();
return dt;
}

private DataTable getnews(int con_id,string date)
{

string sql = "SELECT top 2 News_title FROM tbl_news WHERE News_continent_id='" + con_id + "' and cast(News_createdate as Date)='" + date + "' order by [News_id] Desc";
SqlCommand cmd = new SqlCommand(sql, cs.GetConnection());
cs.OpenConnection();
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
cs.CloseConnection();
return dt;
}
protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
DataRowView drv = (DataRowView)e.Item.DataItem;
int con_id = Convert.ToInt32(drv["con_id"]);
Repeater Repeater3 = (Repeater)e.Item.FindControl("Repeater3");
Repeater3.DataSource = u.gtdate(con_id);
Repeater3.DataBind();

}
protected void Repeater3_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
DataRowView drv = (DataRowView)e.Item.DataItem;
DateTime date = Convert.ToDateTime(drv["News_createdate"]);
//int con_id = Convert.ToInt32(dr["con_id"]);
string dt = date.ToString("yyyy/MM/dd");
Repeater Repeater2 = (Repeater)e.Item.FindControl("Repeater2");
Repeater2.DataSource = getnews(con_id, dt);
Repeater2.DataBind();
}

protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)
{
if (e.CommandName == "lnkclick")
{
Label lbl = (Label)e.Item.FindControl("titleLabel");
int i = u.get_cid(lbl.Text);
Response.Redirect("news1.aspx?id=" + i);
}
}

Here hierarchy is like this:

Repeater1 -> Repeater3 -> Repeater2

I want to get con_id value from Repeater1 to Repeater2