It seems we have a match. Since I last posted I found out that Cora's mother was Susie Sloan, born abt. 1868,daughter of John & Jane Sloan and married to Frank Cramp. I have no other information on Susie & Frank. I don't know if Susie died or if they divorced or if both of them died. Do you have the death date for Susie and Cora?
I would think the baby Joseph E McKinney was Cora & Williams. I haven't come across the name Anderson yet, so I don't know who that could be.