When the grandchildren, who survive with their uncles, aunts, or cousins, inherit from their grandparents in representation of their father or mother, they shall bring to collation all that their parents, if alive, would have been obliged to bring, even though such grandchildren have not inherited the property.
They shall also bring to collation all that they may have received from the decedent during his lifetime, unless the testator has provided otherwise, in which case his wishes must be respected, if the legitime of the co-heirs is not prejudiced. (1038)