Attached points as parent-child relation about bgcurve

[banshee-gzzz]

I'm not sure, it will work ok, but you could try Point's transform field as described here: http://www.bansheegz.com/BGCurve/UserGuide/Spline/
Point's transform field- is a system field- you can assign any transform to be a point's position.
Rotation and scaling also affect point's controls (incoming and outcoming)
So assign parent transform to points[1] and child transform to points[2]