Marie Elizabeth Aycaguer was born in Bayonne France. She met and married Domingo Amestoy on 24 Apr 1863. In 1889, Gless sold The De La Osa rancho to his father in law, Domingo Amestoy. This was the last time the 4,460 acre ranch was sold as a whole. In the coming years, it would slowly be taken apart, a piece at a time.

In 1916, 1,170 acres of land were sold from the Rancho. This parcel was subdivided and became the city of Encino. This Rancho is now known as the Rancho Los Encinos. They had nine children: Juanita Gless, Anthony J., Juan Baptiste, Marie Louise Sentous, Peter Domingo, Michel Francois I, Joseph Paul, Elisabeth Wells and Prosper.

She died March 17, 1891 at the ranch as the Rosescrans Tract, died from pneumonia & meningitis

Los Angeles Herald, Volume 35, Number 155, 18 March 1891

Heath of Mrs. Amestoy. Mrs. Marie E. Amestoy, wife of Domingo Amestoy, died on the ranch at Rosecrans yesterday, at about 3 o'clock in the afternoon. She had been suffering for about eight days with an attack of inflammatory rheumatism. Tht body was brought to this city, to the residence of her daughter, Mrs Simon Gless, on Boyle Heights. Notice of the funeral will appear later. Mr. and Mrs. Amestoy came to Los Angeles at a very early "day, and have lived here ever since. They were young people, recently married, when they came. They were both natives of France. Deceased leaves eight children and her husband to mourn her loss.

THE LOS ANGELES HERALD: WEDNESDAY MORNING, MARCH 1 1891

DEATH OF MRS. AMESTOY.

The Funeral to Take Place Tomorrow Morning. The French colony of Los Angeles sustained a great loss in the death of Mrs. Marie E. Amestoy, whose demise on Tuesday was recorded in yesterday's Herald. Mrs. Amestoy was a lady of great worth and energy, and her kindness to people that she liked was proverbial. She came here in 1862 as the young wife of Don Domingo Amestoy, who bad gone to France to woo and wed Miss Marie E. Aycaguer, and who brought her back with him. His draw in the lottery of matrimony was a fortunate one, and his helpmeet proved not only that she was a good wife and mother but a very able counselor in business. Don Domingo, who had come here in 1849, had at that time engaged in the sheep-raising business. When he returned with Mrs. Amestoy he still pursued the same avocation. As money came in, the deceased lady shrewdly caused it to be invested in realty in the business center, upon which large stores were built. This was before boom times, when a good many capitalists were afraid to thus invest, and it proved a source of wealth for the Amestoy family. The death of Mrs. Amestoy was unexpected. The deceased lady had been ailing for about eight days with inflammatory rheumatism, it is true, but none of her relatives or friends
dreamed that she was to be taken off so suddenly, at the early age of 48. She had given birth to thirteen children, of whom eight survive her to mourn her loss five boys and three girls. Among the latter are Mrs. Simon F. Gless, of Boyle heights, and Miss Louise. The funeral of Mrs. Amestoy will take place tomorrow, at 9 o'clock, and the services will be held at the cathedral. The remains are now lying at the house of her son-in-law, Simon F. Gless, at 131 Boyle avenue, Boyle Heights, from which place the funeral procession will start. The sympathy of a large number of friends' and of the Herald goes to the sorrowing family in their bereavement.