pinchot

AG is likely Alfred Gwynne Vanderbilt. The "Mrs" is unclear to me. He divorced his first wife ca. 1909, and remarried 1911. He died on the Lusitania.

The widow was born Margaret Emerson, herself an heiress of the Bromo Seltzer fortune:

"[Isaac Edward] Emerson's daughter Margaret married at 18 to Dr. Smith Hollins McKim. They became social leaders in New York's high society. But in 1910 she brought a sensational divorce suit against her husband, claiming he beat her in drunken rages. She remarried in 1911, this time to Alfred Gwynne Vanderbilt I, one of the wealthiest men in America having inherited the bulk of his father's fortune in 1889. They had two sons, Alfred Gwynne Jr. and George. Tragically, while traveling to England on business, Alfred Sr. heroically lost his life in the sinking of RMS Lusitania by torpedo in 1915. Margaret inherited her husband's fortune (as well as the bulk of her father's fortune when he died). One son from this marriage, Alfred Gwynne Vanderbilt II went on to become one of the driving forces behind thoroughbred racing in America. Margaret married two more times, both ending in divorce. In 1931 she legally resumed her maiden name."
en.wikipedia.org/wiki/Captain_Isaac_Edward_Emerson
Margaret Emerson's obituary from January, 1960:
select.nytimes.com/gst/abstract.html?res=9D06E4DD1138E333...

A.G. Vanderbilt in another Bain photo:

hdl.loc.gov/loc.pnp/ggbain.05295 is a picture of Mrs. Mckim/Vanderbilt from the Bain collection -- not yet uploaded to Flickr.

I haven't been able to identify this building. Sources I have consulted say she was living at the Vanderbilt Hotel at the time the Lusitania sank.

And I've found two houses she owned at some point but which it isn't: The Gould house on Fifth Avenue and Eat 67th shown in www.oldpokerchips.com/NonNevada/Gould.htm And a grand house in London, which he left her in his will according to NYT of May 30, 1915 query.nytimes.com/gst/abstract.html?res=F50B17F9385C13738... Gloucester House at Piccadilly and Park Lane pictured at www.amsprop.com/gloucester_house/index.html

See en.wikipedia.org/wiki/Amos_Pinchot I suspect this is in Newport, RI. According to NYT of July 21, 1913 query.nytimes.com/gst/abstract.html?res=9902E0D9153FE633A... Mr. and Mrs. Amos Pinchot had "taken Pinard Cottage No. 4" in Newport.

The building at left, with two courses of scalloped shingles, also appears in the background of this Bain/LOC photo:

This (the first) Mrs.Amos Pinchot is the former Gertrude Minturn. A bio of Amos Pinchot is at
www.spartacus.schoolnet.co.uk/USApinchotA.htm

The uncontested divorce of Amos Pinchot by Gertrude was reported in NYT On Dec 9. 1918
query.nytimes.com/gst/abstract.html?res=9505E3D61239E13AB...

The NYT article reports that daughter Rosalind was 17 (in 1918 when her parents divorced).

www.newyorksocialdiary.com/node/136306 has the daughter of Gertrude Minturn Pinchot as Rosamond, and a picture of Gertrude

Another Bain/LOC photo of Mrs. Gertrude Pinchot and her daughter, Rosamund:

That's probably meant to be Mrs. Charles DeLoosey Oelrichs, a prominent member of Newport society and a member of the Congressional Union for Woman Suffrage too. She married Charles DeLoosey Oelrichs (1882-1973), a stockbroker, in 1907, and they were divorced in 1921.

They had one child, daughter Margery (aka Marjorie, aka "Bubbles"); maybe that's her in the photo. If it is, she eventually married Eddy Duchin, the bandleader, in 1935, and became mother to Peter Duchin (b. 1937). Marjorie Oelrichs Duchin died two days after the birth of Peter.
en.wikipedia.org/wiki/Marjorie_Oelrichs
en.wikipedia.org/wiki/Eddy_Duchin
en.wikipedia.org/wiki/Peter_Duchin

The Mrs. Oelrichs in the photo above does not appear to be the same woman who, in another Bain/LOC photo, also is identified as Mrs. Oelrichs. Perhaps Bain made an error in one of the identifications. Moreover, the daughter in the other photo (who does not resemble the girl in this one) is identified as "Margaret," not "Marjorie." Here is the other photo:

Indeed, Wystan, this woman and daughter look more like the mother and daughter in the pictured labeled as Mrs. Amos Pinchot.
www.flickr.com/photos/library_of_congress/4037482176/
The daughter, in particular looks to be wearing the same hat.

www.newyorksocialdiary.com/node/136306
has pictures of Gertrude Minturn Pinchot that look like this woman, but is mainly about her daughter, who was the actress Rosamond Pinchot. Pictures of Rosamond as a girl on the web page could certainly be this girl.

The Oelrichs seem like a complicated family with a lot of same-named people; Margery/Marjorie Oelrichs, daughter of the Charles DeLoosey Oelrichs, was born after 1907, which would seem to make her a little younger than this child.

I like the alternate identification--they do look much more like the Gertrude and Rosamond Pinchot in the photo swanq links to. Not only the same hat on the girl--looks like it could be the same dress, socks, and shoes too!