Inheritance clawbacks for gifts to grandchildren

Let's say my parents gift my children (their grandchildren) a little less than 110万 yen per year for education expenses and that we can clearly document that the money was gifted to my children (not me) and used for education. Would this money gifted to grandchildren be clawed back as inheritance for the three years (or eventually seven years) prior to my parents' deaths if my children aren't heirs in the will (but I am)? (I know that gifts to me are clawed back. I just wonder if gifts to my children are also clawed back…I haven't found straight information on this yet.)

by JPcoolstar