Does anyone know how to make contact with this actress (oliva De
Havilland's sister...)Who represents her? Any leads welcome

Dear Natgrouille, 

You can contact Joan Fontaine through this postal address: 

Joan Fontaine - 
P.O. Box 222600
Carmel, CA 93922

I hope this answers your question. Please contact me if you need any
clarification on this answer before you rate it.

Thank you for the rating!