treen is a land division which can include quarterland + intacks - some older intacks were effectively part of the quarterland farm having been linked with the farm for many generations (is this your Grauf/Rauf case? - tho with very similar names possibly a misreading ?) - however intack/cottage rents could be devised by will (sometimes hived off for younger children) whereas qtrland after the first descent had to go to heir at law (you often see wording that estate inc qtrland + intack lands is settled upon ..)