I need to create node that will be following parent (with little offset), but it won't rotate with parent. Only always translate to parent's position.
Maybe your looking for billboard?
From Ogre3d wiki:
A Billboard is a square polygon that is always pointed at the camera. It is also known as a sprite. To make one, you must first make a BillboardSet. Then the billboard can be added to it on a given position. The BillboardSet is a MovableObject and should therefore be added to a SceneNode. The whole procedure is as follows: