As far as I know, no biography has ever documented that Ernest Hemingway was married to Slim Keith. The New York Times obituary of Slim Keith is listed as a "source" on Slim Keith's Geni page: https://www.geni.com/documents/view?doc_id=6000000017775427004. The obituary refers to Ernest Hemingway as "a close friend", but not a husband. Hemingway's wives were: Hadley Richardson, Pauline Pfeiffer, Martha Gellhorn and Mary Welsh Hemingway. This error should be corrected, since Slim Keith was never married to Hemingway: https://en.wikipedia.org/wiki/Ernest_Hemingway
Absolutely correct! No clue why Slim Keith was added, but I've cut the connection. Thanks for flagging this.