OBIT: A. W. Foster Jr. Stricken In Prime of Life - For the third time in two years death has invaded the home of A. W. Foster and left inconsolable sorrow in its wake. The death of A. W. Foster Jr. Tuesday night at Adler's Sanitarium in San Francisco added another bereavement to the heartbroken parents whose sorrow over the tragedy which befell Robert N. Foster electrocuted a year ago on his ranch at Hopland, is still poignant. A short time prior to that William Foster, a third son, lost his wife and child at Willits. This latest death came as a shock to the family and every man, woman and child in San Rafael, to many of whom the young man was known. It was sudden. The fact that he had been injured about a week ago while playing "squash" ball with some friends in the Olympic Club, was known only to his closest friends, the family, and to them this was not considered serious. A slight abrasion over the eye was evident, but until Sunday this caused the deceased but little annoyance. Monday morning he complained of a severe headache. He was hurried to the sanitarium and grew rapidly worse. A consultation of physicians resulted in a decision to operate. Dr. Lawrence Draper, who is a brother-in-law of the young man, Dr. H. W. Rixford, Dr. Leo Newmark and Dr. Wolfson, performed the operation. That was in mid-afternoon. Eight hours later Mr. Foster succumbed. The physicians announced that a blood clot had formed on the brain. The place left vacant by his father's side will never be filled. Every day for years they have crossed the bay together and been in daily consultation concerning a multitude of affairs of importance. For years the son has been trained by the father gradually to assume a share of the worry incident to the conduct of the family interests. A. W. Foster Jr. was assistant treasurer of the Panama-Pacific International Exposition, president of the Bank of San Rafael and president of the Marin Water and Power Company. He was also secretary of the Foster Company, a real estate corporation organized by his father upon his retirement from the presidency of the California Northwestern Railroad. The company is capitalized at $1,000,000 {$23,248,712.87 circa 2015 -ed.}. He was a member of the Pacific Union and Olympic Clubs, and was 33 years of age. The funeral services will be held at the Foster residence at 2 o'clock this afternoon, and interment will be private. Besides his parents, Mr. and Mrs. A. W. Foster, the deceased leaves three brothers, William A. S. Foster, Paul Scott Foster and Benjamin Foster, and four sisters, Mrs. H. N. Kuechler, Mrs. A. L. Draper, Mrs. F. L. Abbott and Miss Louisiana Foster. The funeral arrangements will be under the direction of Dr. F. W. Sawyer. The honorary pall bearers, chosen among the young man's closest friends, are as follows: William Barr, San Rafael, William P. Murray, San Rafael, William P. Horn, San Rafael, Spencer Grant, San Francisco, Edgar T. Zook, San Rafael, Leroy T. Ryone, San Francisco, Rudolph Schilling, San Francisco, Brendan J. Brady, San Francisco, Ralph L. Phelps, Berkeley, Benjamin Upham, Mill Valley.

SOURCE: Marin Journal, Thursday, May 27, 1915, Page 1.
Source [link]: http://www.sfgenealogy.com/boards/mcobits/archive8/9864.html
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"US CENSUS 1910"
Name: Arthur W Foster
Birthplace: California
Relationship to Head of Household: Son
Residence: San Rafael, Marin, California
Marital Status: Single
Race : White
Gender: Male
Immigration Year:
Father's Birthplace: Ireland
Mother's Birthplace: Louisiana
Family Number: 85
Page Number: 6
Household Gender Age
Parent Arthur W Foster M 59y
Parent Lousiana S Foster F 60y
Arthur W Foster M 27y
Louisiana J Foster F 22y
Paul S Foster M 21y
Martha K Foster F 18y
Benjamin B Foster M 16y
Anna M Scott F 23y
George K Rambe M 35y
Thank S Rambe M 30y
Shawna O'Connell F 51y
Julia E Leahy F 50y
La Img M 44y
Neus Jue M 19y
Hoo M 16y

SOURCE: US Federal Census, 1910.
Source [link]: https://familysearch.org/pal:/MM9.1.1/MVL6-Q6F