Board Thread:Questions and Answers/@comment-31125534-20181217091825/@comment-33620403-20181217100020

For Cassandra Sandmark, it's written in the notes : "Zeus was revealed to the audience as Cassie's father in Wonder Woman (Volume 2) #181-183; Cassie suspected it for some time, but did not learn definitively about it until Wonder Woman (Volume 2) #217."

The "mirror image" origin is in Wonder Woman Vol (Volume 2) #134-135. Not sure if it's the first occurrence, though. As for the "all origins are true", I guess you're referring to The Return of Donna Troy ? (more specifically issue 4) where she remembers her life on each Earth ?