Include Grandchildren in EF Query

Update: If you are using Entity Framework Core you should use the following syntax

var hierarchy = from p in ctx.Parents
                    .Include(p => p.Children)
                    .ThenInclude(c => c.GrandChild)
                select p;

Sure, you can do

var hierarchy = from p in ctx.Parents
                    .Include(p => p.Children.Select(c => c.GrandChild))
                select p;

See MSDN, caption Remarks, the fifth bullet.