From The Yakima Herald, May 20, 1908:

Mr. Chamberlain, father of Mrs. Walter White, died Thursday and was buried Friday at 11 o'clock. Death was caused from old age and kidney trouble.
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From "The History Of Washington: The Evergreen State," by Julius Hawthorne and George Douglas Brewerton, published by American Historical Publishing, 1893, page 521:

Chamberlain, James L., of North Yakima, farmer, of Naches Valley, was born in 1830 in Kentucky, second in a family of four born to Paul P. and Elizabeth (Hatten) Chamberlain. He removed with his parents to Missouri in 1844, remaining in Andrew County until 1851, when he crossed the plains by ox-team. At Bear River he rescued a train in their rear which had been attacked by Indians and defeated, with loss of one man killed and a man and girl wounded. The train in front of them was also molested. They left a forked stick in the road with a note asking Mr. Chamberlain's train to reinforce them at Grand Tullies, they having had a fight in which several Indians had fallen. After many privations, being obliged to subsist on parched corn, they reached the Willamette, where Mr. Chamberlain settled and engaged in the wood business. He was snow-bound while en route to California, where he mined for sixteen months. Returning, he lived at Salem eight years. Many changes and various employments followed, all suggestive of the enterprise and energy of the man until 1886, when we find him in Old Yakima engaged in the livery and hotel business. In 1889 he removed to his present location, and settled a fine farm of 160 acres, where he raises crops of hops, grain, and grass. He has a fine orchard, and is a stock-raiser also. He was married in 1853 to Miss Christina Kincaid, daughter of Samuel Kincaid, a wealthy Missouri farmer. They have eleven children. Mr. Chamberlain is a Democrat.
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The Yakima Herald, December 1, 1898:

Forty-seven years is a long time in one family's life, and two brothers in Yakima realized this fact the other day. T. W. Chamberlain, of Maryville, Mo., paid a visit to his brother, J. L. Chamberlain, a resident of North Yakima, last week, which was the first meeting of the twain since the year 1851, when J. L. Chamberlain left home to cross the plains to the far distant Willamette, taking six months' time with an ox team.

T. W. Chamberlain was born in 1836 and his brother, J. L., in the year 1830. Mr. Chamberlain the elder has been a resident of Washington nineteen of the forty-seven years he has spent on this coast. The delight of the brothers on clasping hands again and recalling the reminiscences of their young manhood at a real Thanksgiving turkey feast may be better imagined than described. Mr. T. W. Chamberlain previously paid a visit to a sister in Goldendale whom he had not seen for years.