(These came in a small batch of postal cards to his wife. The bulk of his papers seem to have been donated to the Bancroft Library in Berkley) Wish there had been more to their travels.
Frank Otis:
Born in San Francisco, November 18, 1852 (7 Jan 1932); member of the first freshman class of the University of California, graduating in 1873; lawyer, admitted to the California bar on April 11, 1876; represented Alameda County in the California State Assembly, 1907-1911; Mayor of Alameda, 1913-1915, elected to a second term in 1919; Alameda City Council member, 1917-1919.
Lucretia Lockwood Mastick Otis 1859-1937
Edwin M. Otis 1882-1943
Harold Otis 1883-1887
Stephen F. Otis 1886-1971
(Writing back to his wife while on a trip to Irvine Ranch In LA county)
UX7 (S6)
3 nice cancels: Santa Ana -13 Jun 1886 (with random cut-cork) - Oakland - Alamada


History of Irvine ranch:
James Irvine died in 1886. The ranch was
inherited by his son
https://en.wikipedia.org/wiki/Irvine,_CaliforniaHistory of Santa Ana:
Santa Ana was incorporated as a city in 1886 with a population of 2000 and in 1889 became the seat of the newly formed Orange County.
https://en.wikipedia.org/wiki/Santa...,_Californiahttps://en.wikipedia.org/wiki/Ojai,_Californiahttp://ojaihistory.com/tag/oak-glen-cottages/"Additional accommodations were soon necessary to harbor the throng of home and health seekers who came into the valley, so that McKee's canvas tent was transformed into an attractive building, under the appropriate title of Oak Glen Cottage…
Seems Frank was here for health reasons with Edwin, wife and Stephen back in Alameda.
Nordhoff 11 Mar 1874 to Ojai 16 Apr 1917
UX9 (S8) Nordhoff, Cal. Mar. 19, 1889


(Edward to climb Mt. Shasta)
Sisson, Siskiyou Co. Jul 20, 1898
The post office opened in 1870 as Berryvale.[11] After 1886 it was known as Sisson after a local businessman, Justin Hinckley Sisson who ran a stagecoach inn and tavern as well as donated the land for the town site and the Central Pacific Railroad station in 1886.
To Mount Shasta 1 May 1924
https://en.wikipedia.org/wiki/Mount...,_CaliforniaThe 1887 completion of the Central Pacific Railroad, built along the line of the Siskiyou Trail, brought a dramatic increase in tourism, lumbering, and population into Mount Shasta.

"takes 3 days to climb..."

(Early history of Mt. Shasta assents.)
The story by John Muir is interesting.
https://www.siskiyous.edu/library/s...ineering.htm(Frank and Edward head to Yosimite)
https://tchistory.org/out-to-tuolumne/Prominent businessman, Charles H. Carter, owned a general store in Long Gulch about two miles south of Summersville. When the Eureka Mine was discovered in 1858 by Joseph and James Blakely, the entire population of Long Gulch, along with Carter's store moved to the area of the Eureka Mine, which was located on the northeast side to the town common. Summersville business district was developed and built around the common. In 1888, Summersville residents petitioned to have their own post office however a post office called "Somersville" already existed in Contra Costa County. Fearing confusion, their petition was denied. In December 1888, it was agreed that since the post office was located at the store of Charles Carter, the town would be called Carter or "Carters." Carters 14 Dec 1888. To Tuloumne 15 mar 1908
UX18 (S22) Carters, Tuloumne Co.7 Jun 1904

"the three jacks ( male donkey - a jack) were rotten. They wouldn't go, shook all the packs off........... Expert to start for Lake Eleanor Tues morning...
https://en.wikipedia.org/wiki/Lake_Eleanor
On the way to Tuloumne Meadows

" We are here - 150 of around a huge bon-fire...."

Yosemite 19 Jul 1904. ( My reference says YO Semite 9 Aug 1869 to 7 Dec 1908. Then Yosemite 7 Dec 1908 to Yosemite National Park 7 Apr 1922.

https://www.yosemite.com/the-buffal...of-yosemite/It would be possible that at some point they passed on the trail.

Sequoia 27Jul 1904 24 Jul 1886 (To Groveland 15 Dec 1915)
https://en.wikipedia.org/wiki/Grove...,_California
"this valley is almost as beautiful as Yosemite"

Picture of Hetch Hetchy before dam

(After) Wapama-Falls
https://www.myyosemitepark.com/thin...apama-falls/There is a trail that goes over a bridge just below the fall. One year we were there couldn't cross the bridge because of the water flowing over the top of the bridge.

If you made it this far "Thanks for staying".
I live up in this area, and over the years have traveled many of the same trails with my wife and son.
pat
Here is an interesting review of the epic battle for the fate of Hetch Hetchy
https://morethanjustparks.com/hetch-hetchy/And here if you would like to see Yosemite through John Muir's eyes.
https://vault.sierraclub.org/john_m...he_yosemite/