Just listened to Paeter's review of Professor Marston and the Wonder Women. Then I found the following article, detailing Marston's granddaughter Christie's reaction to the film.
http://dccomicsmovie.com/christie-marston-criticizes-professor-marston-and-the-wonder-women/
The short of it is that she claims the film is a complete work of fiction (Paeter suspected there was a lot of fiction at play), and that nobody in the Marston family was consulted in the writing of the script.
She points toward this article as the true story
https://www.psychologytoday.com/blog/beyond-heroes-and-villains/201710/the-true-story-wonder-womans-marston-m-nage-trois
Both are an interesting read.
http://dccomicsmovie.com/christie-marston-criticizes-professor-marston-and-the-wonder-women/
The short of it is that she claims the film is a complete work of fiction (Paeter suspected there was a lot of fiction at play), and that nobody in the Marston family was consulted in the writing of the script.
She points toward this article as the true story
https://www.psychologytoday.com/blog/beyond-heroes-and-villains/201710/the-true-story-wonder-womans-marston-m-nage-trois
Both are an interesting read.