At the death of a child who is under age, who is without issue and who has not been married, all the other children of the parent being also dead, if any of the other children left issue, the estate that came to the child by inheritance from the parent descends to all the issue of the other children of the same parent, and if all the issue are in the same degree of kindred to the child, they are entitled to share the estate equally; otherwise, they are entitled to take according to the right of representation.