Image created using AI at Canva.com (which is why the detective seems to only have 3 fingers per hand)
The mystery from the post Who are these People has been solved! The remaining subject of the circa 1890 photo of the Brinkman family has been identified.

A contact on Ancestry.com, discovered through the DNA of my wife, Ann, advised that he thought the unknown man was Edward Rechenbach, who married Georgia “Georgie” Brinkman. I have a much later group photo with the name written on the margin.

The man identified as Edward Rechenbach is on the far right in the picture. (His wife, Georgia, by the way is standing in the center of the photo and labled “Aunt Dord”). I was worried about using the photo for AI comparison because I was afraid that the pipe in his mouth would be read as part of his face, so I used a similar photo obviously taken on the same day in 1923 – more than 100 years ago, but about 30 years after the circa 1890 photo of the family. In that photo, Edward Rechenbach would be the man on the far left.

Despite the intervening decades, the “face-compare” tool at FacesShape.com found the two subjects were 100% similar.
So the picture, with eveyone in it identified (to my current satisfaction, at least) is below.
Georgia “Georgie” Brinkman (daughter of George F. Brinkman and Jennie Henderson); Edward Rechenbach (husband of Georgia); Jennie Henderson (wife of George F. Brinkman and mother of Georgia, Edna, and Raymond O. Brinkman); Raymond O. Brinkman; Edna Brinkman; and George F. Brinkman.
It is time to move on to the next mystery. I don’t know what it is, but I’m sure it is just around the corner.