Hi guys, I wanna get children items in Group Tours, i have tried so many ways but still not showing children items. Please help me, teach me how to do it :(

and here is the code i try, but it's wrong

    @inherits Umbraco.Web.Mvc.UmbracoViewPage<ContentModels.GroupTours>
@using ContentModels = Umbraco.Web.PublishedModels;
@{
    Layout = "master.cshtml";
    var home = (Home)Model.Root();
    var numberOfGroupTours = (int)Model.HowManyGroupToursShouldBeShown;
    var newsTours = Model.Children.OrderByDescending(c => c.CreateDate).ToList();
    var pageCount = (int)Math.Ceiling((double)newsTours.Count / numberOfGroupTours);
    //gets the page from the querystring and sets it to one if it is out of range
    var page = 1;
    if (!string.IsNullOrEmpty(Request.QueryString["page"]))
    {
        int.TryParse(Request.QueryString["page"], out page);
        if (page <= 0 || page > pageCount)
        {
            page = 1;
        }
    }
    //Gets the tours for the current page
    var pagedNewsTours = newsTours.Skip((page - 1) * numberOfGroupTours).Take(numberOfGroupTours).ToList();
}

and

 @{
                    if (Model.Children != null)
                    {
                        foreach (GroupTours gtours in pagedNewsTours)
                        {
                            foreach (ToursItem toursItem in pagedNewsTours)
                            {
                            <div class="item_tours">
                                <div class="row">
                                    <div class="col-md-12">
                                        <h2 class="name_tours">
                                            <a href="@toursItem.Url()">
                                                @toursItem.PageTitle
                                            </a>
                                        </h2>
                                        <div class="price">@toursItem.Price</div>
                                    </div>
                                </div>
                                <div class="float">
                                    <a href="@toursItem.Url()">
                                        <img class="img_tours" src="@toursItem.ThumbnailImage.LocalCrops" alt="">
                                    </a>
                                    <div class="summary_tours">
                                        @toursItem.ShortContent
                                    </div>
                                </div>
                            </div>
                                }
                            }
                        }
                    }

Help me. Thank you so much guys :(