Question: John Carroll Power served as the first custodian of a tomb of a president and how many of his sons ?
Context: Robert Brent (1764 – September 7, 1819) was the first mayor of Washington, D.C., the federal capital of the United States of America.  Brent was born into a prominent Catholic family, for which the Brent Society is named.  The family lived in Woodstock, which was then in Stafford County, Virginia.  His mother was Ann Carroll, whose brother John Carroll was the first Catholic Bishop appointed for the United States.  Brent's father was a contractor and quarry owner. John Leonard Horn (September 7, 1928 – August 18, 2006) was a scholar, cognitive psychologist and a pioneer in developing theories of multiple intelligence.  Horn, together with Raymond Cattell, developed the theory of crystallized and fluid intelligence.  This theory was later combined with the work of John Carroll and called the Cattell–Horn–Carroll theory.  The CHC theory is the basis for many modern IQ tests. Judy Cannato was an American Catholic author, retreat facilitator, and spiritual director.  Educated at Ohio University and John Carroll University with master's degrees in education and religious studies, she was an associate member of the Congregation of St. Joseph and maintained an office at River's Edge, a ministry of the Sisters of St. Joseph in Cleveland, Ohio.  Married with two grown sons, Cannato concentrated on the relationship between science and religion in her retreats and writings.  Judith Cannato died from a rare form of cancer on May 7, 2011, at the age of 62. Thomas Conley was an American football player and coach of football and basketball.  Conley played college football at the University of Notre Dame from 1928 to 1930.  He was the captain of the 1930 Notre Dame Fighting Irish football team, which won a national championship.  Conley was named a Second Team All-American as an end that year.  He served as the head football coach at La Salle University from 1931 to 1932 and at John Carroll University from 1936 to 1942, compiling a career college football coaching record of 33–34–7.  Conley was also the head basketball coach at La Salle from 1931 to 1933 and at John Carroll from 1936 to 1943, tallying a career college basketball mark of 86–87.  He worked as an assistant football coach in charge of the ends at his alma mater, Notre Dame, from 1933 to 1935.  A native of Philadelphia, Conley attended Roman Catholic High School there. John Carroll Power (September 19, 1819–January 11, 1894) was an American historian who served as the first custodian of the tomb of Abraham Lincoln, the 16th President of the United States, at Oak Ridge Cemetery in Springfield, Illinois from its opening in 1874 to his death in 1894. Don Shula Stadium is a multi-purpose stadium located on the campus of John Carroll University in Cleveland, Ohio.  Don Shula Stadium is home to the Division III Blue Streaks of John Carroll University and has an official capacity of 5,416 spectators.  It also serves as a home for many of the school's varsity, club and intramural athletic programs.  The facility is named for Pro Football Hall of Fame coach and former NFL player, Don Shula.  Shula was a cornerback for the Blue Streaks in the late 1940s and was drafted in the ninth round of the 1951 NFL Draft. Allen Henry "Mal" Elward (June 23, 1892 – December 31, 1982) was an American football player, coach of football and basketball, and college athletics administrator.  He served as the head football coach at Grinnell College from 1922 to 1923, at John Carroll University from 1924 to 1926, and at Purdue University from 1937 to 1941, compiling a career college football record of 32–42–8.  Elward was also the head basketball coach at John Carroll from 1924 to 1927, tallying a mark of 22–24.  He was the athletic director at Purdue in 1941.  Elward played football as an end at the Notre Dame University from 1912 to 1915.  He served as an assistant football coach at Purdue from 1927 to 1936 and at Stanford University from 1946 to 1956. The Lincoln Tomb is the final resting place of the 16th President of the United States, Abraham Lincoln, his wife, Mary Todd Lincoln, and three of their four sons.  It is located in Oak Ridge Cemetery in Springfield, Illinois. John M. Facciola (born in 1944) served as a United States Magistrate Judge for the United States District Court for the District of Columbia, from his appointment in August, 1997 until his retirement in December, 2014.  Prior to being appointed to the bench, he served as an Assistant District Attorney in Manhattan from 1969–1973, and was in private practice in the District of Columbia from 1974–1982.  Judge Facciola joined the U.S. Attorney's Office in 1982.  He served in the Appellate and Civil Divisions and then as Chief of the Special Proceedings section from 1989 until his appointment as Magistrate Judge.  He has been an adjunct professor of law at Catholic University and at Georgetown University Law Center, a fellow of the American Bar Foundation and a member of the Board of Governors of the John Carroll Society.  He has been the Editor in Chief of the Federal Courts Law Review, the electronic law journal of the Federal Magistrate Judges Association.  He is also on the Advisory Board for the Sedona Conference, an organization which brings together attorneys, judges, and experts to help advance the law in a collaborative, just and reasoned manner.  Facciola has been a leader in issues related to electronic discovery.  He has written a number of opinions and lectures frequently on the topic. Zorro Rides Again (1937) is a 12-chapter Republic Pictures film serial.  It was the eighth of the sixty-six Republic serials, the third with a western theme (a third of Republic's serials were westerns) and the last produced in 1937.  The serial was directed by William Witney & John English in their first collaboration.  The serial starred John Carroll who also sang the title song as a modern descendant of the original Zorro with Carroll stunt doubled by Yakima Canutt.  The plot is a fairly standard western storyline about a villain attempting to illicitly take valuable land (in this case a new railroad).  The setting is a hybrid of modern (1930s) and western elements that was used occasionally in B-Westerns (such as the western feature films also produced by Republic).  It was also the first in a series of five Zorro serials: "Zorro's Fighting Legion" (1939), "Zorro's Black Whip" (1944), "Son of Zorro" (1947) and "Ghost of Zorro" (1949).
Answer: three of their four sons