how to duplicate parented objects ?

Let say I make to cubes parented to an empty. If I duplicate the empty, the cube isn’t duplicated. Is it possible to duplicate a whole group of parented objects, selecting only the parent ?

Nope not as far as I know.

You can set what gets duplicated along with an object in the settings menu (drag down the top bar).

It’s in edit methods… and “children” is not there. Might be a nice feature, though only in a few cases.

Shift+G->Children, Shift+D