Families.cs

private IEnumerable<Family> _families;
public virtual IEnumerable<Family> Families 
{
   get
   {
         if (_families != null)
         {
            return _families;
         }

         GetItemsByQueryOptions builder = new GetItemsByQueryOptions();
         builder.Query = new Query("/Families");
         builder.InferType = true;
         builder.TemplateId = "{E7A480B9-F931-4D37-AA56-58264A26F49F}";
         builder.RelativeItem = Sitecore.Context.Database.GetItem(new ID(this.Id));
         return new RequestContext(new SitecoreService(Sitecore.Context.Database)).SitecoreService.GetItems<Family>(builder);
   }
   set
   {
      this._families = value;
   }
}