How was Peter Lawford related to Arnold Schwarzenegger?

Peter Lawford's 1st wife was John F. Kennedy's sister Patricia. She was an aunt to Maria Shriver, Arnold's ex wife. Does that make Lawford Schwarzenegger's uncle?
 

I did not know that Arnold and Shriver were not married any longer but if they were then Lawford would be step-uncle to Arnold if there is such a thing as a step-uncle.
 


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