The best way to export character animations is to bake all motions before they are written with Cinema 4D's “Cappucino” tool:
Make the parent object editable and keep it selected.
Go to Character > Manager > Cappucino.
In the “Cappucino” window, perform the following settings.
Drag the timeline slider to frame 0.
Click on an empty area of the viewport and keep the left mouse button pressed – the animation starts automatically.
When the last frame has been reached release the mouse.
Open the “RealFlow SD Exporter”, and export the object with the “vertex” option.