|Someone wrote in dee_burris,|
Do you know where the other grave was, for sure? If so, you can contact them about the records for Mr. Shinn.
What most likely happened, like the other lady mentioned, was that Minnie died and the family re-interred his body with his wife.
The above picture was probably taken in 1917, when he died. Maybe the little girl is a granddaughter.
Perhaps they reused this already paid for grave for Minnie's neice. I would request information from both cemeteries, and I would also research the neice's death to see if it is probable that she reused the family plot.