In the event of the death of any son or daughter of the propositus before the opening of successions, the children of such son or daughter, if any, living at the time the succession opens, shall per stripes receive a share equivalent to the share which such son or daughter, as the case may be would have received if alive, বিধানটি কোন আইনে সন্নিবেশিত হয়েছে?