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Yes, Jordan Ladd is the daughter of Cheryl Ladd, and David Ladd, now divorced.
Alana Susan Ladd IS the daughter of Alan Ladd and his wife, Sue Carol. Alana was born on 21st April 1943
Cheryl Ladd is NOT the daughter of Alan Ladd Sr. She was married, now divorced from Alan Ladd Sr's youngest son, David Ladd.
Kathy Ladd's birth name is Ladd, Kathleen.
Dewitt Ladd Rucker went by Ladd.
Alana Ladd's birth name is Alana Susan Ladd.