When Omitted Children and Grandchildren Take by

Succession; When Not. When a testator omits to provide in his will for any of his children, or for the issue of any deceased child, whether born before or after the making of the will or before or after the death of the testator, and such child or issue is unprovided for by any settlement, and has not had an equal proportion of the testator's property bestowed upon him by way of advancement, unless it appears from the will that such omission was intentional, such child or such issue succeeds to the same share in the estate of the testator as if the testator had died intestate.