Art. 1240.  Grandchildren; collation of donations made by grandparent to parent.

In like manner, the grandchild, when inheriting in his own right from the grandfather or grandmother, is not obliged to refund the gifts made to his father, even though he should have accepted the succession; but if the grandchild comes in only by right of representation, he must collate what had been given to his father, even though he should have renounced his inheritance.