Stop Player Rotating around Parent

[Mekphen]

Hey,
is there any possibility to stop Rotating the Player around his parent.
If i set a Entity as a Parent of the Player

pl:SetParent(self)
pl:Fire("SetParent","mount",0)

The Player is rotating around the Parent.
In this case the Parent is a Horse on wich the Player shoud mount on. Everything is working and he can move with the Horse Entity but the Player Model also Moves on Mouse Mooving.
Hope your understand what my Problem is, my English is not the best and i'm also quite new in lua