The 1990 book [Sleeping Beauty:
Memorial Photography in America][1] says: 

>To remove the stigma of death from the home this "death room" became a "living room" by simple decree by the editor of the *Ladies Home Journal*. By the end of the first decade of the twentieth century more and more funerals were being performed in Funeral "Parlors." And the home no longer had a "parlor." The "living room" became a true room for the living. 

... 

>Edward Bok , editor of the Ladies Home Journal , stipulates that room designs for the Journal never show parlors , but rather “ living rooms .

The 1921 book [A Dutch Boy Fifty Years After][2] by Edward Bok says: 

>and in place of the American parlor , which he considered a useless room , should be substituted either a living - room or a library .


The closest I see in the actual *Ladies Home Journal* is [September 1887][3]: 

>A really handsome, tasteful parlor - and not a grand apartment by any means, but one that might better, perhaps, be called a "living-room" —is a far rarer sight than a pretty bedroom ; and when not much used, it is too often all piano and carpet. It is to be supposed that there are a few other things in the room; but the piano as large and the carpet loud, and attention is therefore riveted upon them. With dead-white walls for a
background, a more unhappy combination could not well be inspired. And all this ugliness, when charming rooms can be bad under the most ad verse circumstances I The substance of the following illustration has 

However, the point of Bok in his book is that the Ladies Home Journal had floor plan drawing and would avoid using the word "parlor" and instead use the word term "living room".


  [1]: https://www.google.com/books/edition/Sleeping_Beauty/wS7XAAAAMAAJ?hl=en&gbpv=1&bsq=%22funerals%20were%20being%20performed%20in%20Funeral%22
  [2]: https://www.google.com/books/edition/A_Dutch_Boy_Fifty_Years_After/ypwUAAAAYAAJ?hl=en&gbpv=0
  [3]: https://upload.wikimedia.org/wikipedia/commons/2/2e/Ladies%27_Home_Journal_and_Practical_Housekeeper_Vol.4_No.10_%28September%2C_1887%29.pdf