Question: Walter Alvarez's father was born in what year?

Context paragraphs:
T. Rex and the Crater of Doom: T. rex and the Crater of Doom is a nonfiction book by professor Walter Alvarez that was published by Princeton University Press in 1997.  The book discusses the research and evidence that led to the creation of the Alvarez hypothesis, which explains how an impact event was the main cause that led to the Cretaceous–Paleogene extinction event.

Alvarez hypothesis: The Alvarez hypothesis posits that the mass extinction of the dinosaurs and many other living things during the Cretaceous–Paleogene extinction event was caused by the impact of a large asteroid on the Earth.  Prior to 2013, it was commonly cited as having happened about 65 million years ago, but a 2013 paper by Renne et al. gave an updated value of 66 million years.  Evidence indicates that the asteroid fell in the Yucatán Peninsula, at Chicxulub, Mexico.  The hypothesis is named after the father-and-son team of scientists Luis and Walter Alvarez, who first suggested it in 1980.

ChronoZoom: ChronoZoom is a free open source project that visualizes time on the broadest possible scale from the Big Bang to the present day.  Conceived by Walter Alvarez and Roland Saekow and developed by the department of Earth and Planetary Science at the University of California, Berkeley in collaboration with Microsoft Research and Moscow State University, Alvarez unveiled the first ChronoZoom prototype at UC Berkeley's 2010 Faculty Research Lecture.  That demo is available to the public online, and a second version rewritten in HTML5 is now available and open source.  ChronoZoom was inspired by the study of Big History, and it approaches the documentation and visualization of time and history in the same way that Google Earth deals with geography.  ChronoZoom allows users to see the true scale of time over cosmic, geologic, biological and social periods.

Michael Chandler: Michael Chandler Jr. (born April 24, 1986) is an American mixed martial artist fighting in the lightweight division.  He is currently under contract with Bellator MMA where he is a former two-time Bellator Lightweight Champion.  He was also the winner of the .  Chandler is currently ranked as the #7 Lightweight in the world accrording to FightMatrix.com and is regarded as one of the top 20 greatest Lightweight fighters of all time.  He was the 2011 Breakthrough Fighter of the Year.  He holds notable victories over UFC Lightweight Champions Benson Henderson and Eddie Alvarez.

Walter Alvarez: Walter Alvarez (born October 3, 1940) is a professor in the Earth and Planetary Science department at the University of California, Berkeley.  He is most widely known for the theory that dinosaurs were killed by an asteroid impact, developed in collaboration with his father, Nobel Prize winning physicist Luis Alvarez.

3581 Alvarez: 3581 Alvarez (1985 HC) is a Mars-crossing asteroid discovered on April 23, 1985, by Shoemaker, C. and Shoemaker, E. at Palomar.  Based upon lightcurve data, it has a synodic rotation period of  hours with an amplitude variation of in magnitude.  With a diameter of ~14 km, it is one of the largest Mars-crossing asteroids.  However, due to the high inclination of its orbit, it never actually passes through the orbit of Mars since at perihelion it is well away from the plane of Mars' orbit.  The asteroid is named after planetary scientist Walter Alvarez and his Nobel-prize winning father, physicist Luis Alvarez.

Baron Northbourne: Baron Northbourne, of Betteshanger in the County of Kent, is a title in the Peerage of the United Kingdom.  It was created in 1884 for Sir Walter James, 2nd Baronet, who had earlier represented Hull in the House of Commons as a Conservative.  His son, the second Baron, sat as a Liberal Member of Parliament for Gateshead.  s of 2010 the titles are held by the latter's great-grandson, the fifth Baron, who succeeded his father in 1982.  Lord Northbourne is one of the ninety elected hereditary peers that were allowed to remain in the House of Lords after the passing of the House of Lords Act 1999, and sits as a cross-bencher.  The James Baronetcy, of Langley Hall, in the County of Berkshire, was created in the Baronetage of Great Britain in 1791 for the first Baron's grandfather Sir Walter James, the last Warden of the Mint.  Born Walter James Head, he assumed by Act of Parliament the surname of James only in 1778.  His son and heir John James notably served as Minister Plenipotentiary to the Netherlands.  The latter was the father of the second Baronet, who was raised to the peerage in 1884.

Frank Asaro: Frank Asaro (born Francesco Asaro, July 31, 1927 – June 10, 2014) was an Emeritus Senior Scientist at the Lawrence Berkeley National Laboratory associated with the University of California at Berkeley.  He is best known as the chemist who discovered the iridium anomaly in the Cretaceous–Paleogene boundary layer that led the team of Luis Alvarez, Walter Alvarez, Frank Asaro, and Helen Michel to propose the Asteroid-Impact Theory, which postulates that an asteroid hit the Earth sixty-five million years ago and caused mass extinction during the age of the dinosaurs.

Luis Walter Alvarez: Luis Walter Alvarez (June 13, 1911 – September 1, 1988) was an American experimental physicist, inventor, and professor who was awarded the Nobel Prize in Physics in 1968.  The American Journal of Physics commented, "Luis Alvarez was one of the most brilliant and productive experimental physicists of the twentieth century."

Bartolo Alvarez: Bartolo Alvarez (born 9 November 1914) was a Puerto Rican musician and entrepreneur best known for establishing Casa Latina in East Harlem, New York in 1948.  This record store still stands today, and was the first Spanish-language music shop opened in the United States.  He was the father of five children.

Supporting paragraphs: 3581 Alvarez Luis Walter Alvarez
Answer: 1911