Rotating a child actor

I have a parent actor which rotates in place with another actor parented to it.
I want to make the child actor smoothly rotate relative to the parent via a keypress.

At the moment, this blueprint is causing the child actor to spin very quickly.

http://puu.sh/jRA8I/f5195a5719.jpg

Would I somehow be able to make a Get Parent Actor Rotation node?

Any suggestions?

Resolved by using a timeline and lerp as seen here:

http://puu.sh/jXAhd/a320e612c4.png