What have you tried?
What does the curve look like?
How have you brought that curve into Revit?
Have you gotten the curve into Dynamo?
What scale is the project in?
What are your units?
Does family rotation about the Z axis matter?
Is the family not meant to be vertical?
What type of families?
Any hosting involved?
Which Revit year?
Which Dynamo build?
Is the family in the project already?
As you can see there are more questions created by your request for help than answers.
Best to start here: How to get help on the Dynamo forums