The steps to follow in the plugin are the next:
Go to Systems, and click in the plugin
Click in the buton Select son1
Select the first son of the father
The plugin adds all the son to the nodeTab
But, now, how the slaves start getting (getValue) their values? It's supossed that they get the value about the position change made by their father (more long distance made in this frame, more movement added to the sons).