Question: What man born in 1836 was both the grandson and father of U.S. Senators?

Context articles: Transylvania University
Eugene Hale
United States Senate elections in New York, 1789
Electoral history of Thomas F. Bayard
List of United States Senators from Mississippi
Allard K. Lowenstein
List of African-American United States Senators
Incumbency advantage for appointed U.S. Senators
Frederick Hale (US senator)
Senatorial courtesy

Transylvania University is a private university in Lexington, Kentucky, United States.
 It was founded in 1780, making it the first university in Kentucky and among the oldest in the United States.
 It offers 36 major programs, as well as dual-degree engineering programs, and is accredited by the Southern Association of Colleges and Schools.
 Transylvania's name, meaning "across the woods" in Latin, stems from the university's founding in the heavily forested region of western Virginia known as the Transylvania Colony, which became most of Kentucky in 1792.
 Transylvania is the alma mater of two U.S. vice presidents, two U.S. Supreme Court justices, fifty U.S. senators, 101 U.S. representatives, 36 U.S. governors, and 34 U.S. ambassadors, making it a large producer of U.S. statesmen.
 Its medical program graduated 8,000 physicians by 1859.
 Its enduring footprint, both in national and Southern academia, make it among the most prolific cultural establishments and the most storied institutions in the South.
Eugene Hale (June 9, 1836October 27, 1918) was a Republican United States Senator from Maine.
The 1789 United States Senate election in New York was held in July 1789 to elect two U.S. Senators to represent the State of New York in the United States Senate.
 It was the first such election, and before the actual election the New York State Legislature had to establish the proceedings how to elect the senators.
Thomas F. Bayard served sixteen years in the United States Senate.
 The Delaware General Assembly chose the U.S. Senators, who took office March 4, for a six-year term.
 The U.S. Secretary of State and U.S. Ambassadors are appointed by the President of the United States with the consent of the U.S. Senate.
Mississippi was admitted to the Union on December 10, 1817, and elects senators to Class 1 and Class 2.
 Its current senators are Republicans Thad Cochran and Roger Wicker.
 As of January 1, 2015, 50 people (all of them men) have served as U.S. Senators from Mississippi.
Allard Kenneth Lowenstein (January 16, 1929 – March 14, 1980) was an American Democratic politician, including a U.S. Representative of the 5th Congressional District in Nassau County, New York for one term in 1969 to 1971.
 His work in the Civil Rights Movement and the antiwar movement has been cited as an inspiration by public figures including U.S. Secretary of State John Kerry; former U.S. Senators Bill Bradley, Gary Hart and Donald W. Riegle, Jr.; former U.S. Representative Barney Frank, California gubernatorial candidate Phil Angelides, columnist William F. Buckley, Jr., actor Warren Beatty, former White House Counsel Gregory Craig, former New York City Public Advocate Mark Green, and musician-songwriters Peter Yarrow and Harry Chapin.
The United States Senate has had ten African-American elected or appointed office holders.
 The United States Senate is the upper house of the bicameral United States Congress, which is the legislative branch of the federal government of the United States.
 The US Census Bureau defines African Americans as citizens or residents of the United States who have origins in any of the black populations of Africa.
 The term is generally used for Americans with at least partial ancestry in any of the original peoples of sub-Saharan Africa.
 During the founding of the federal government, African Americans were consigned to a status of second-class citizenship or enslaved.
 No African American served in federal elective office before the ratification in 1870 of the Fifteenth Amendment to the United States Constitution.
 The Fifteenth Amendment prohibits the federal and state governments from denying any citizen the right to vote because of that citizen's race, color, or previous condition of servitude.
 Of the ten senators, six were popularly elected (including one that previously had been appointed by his state's governor), two were elected by the state legislature prior to the ratification of the Seventeenth Amendment to the United States Constitution in 1913 (which provides for the direct election of U.S. Senators by the people of each state), and two were appointed by a state Governor.
 The 113th United States Congress (2013–15) marked the first time that two African Americans served concurrently in the Senate.
Incumbency is one of the most researched and debated topics within the realm of political science.
 However, the research regarding appointed U.S. Senators and the incumbency advantage is not nearly as vast.
 In this research, the relationship between the number of months served as an appointed U.S. Senator and the percentage of vote that appointed senator receives in their initial election is studied.
 It is hypothesized that the longer an appointee has served before an election, the higher percentage of vote that appointee will receive.
 To do this, data was compiled from the United States congressional archives consisting of appointed U.S. Senators, the percentage of vote those appointed senators won in their election after their appointment, as well as the number of months served between their appointment and election.
 Discovering a relationship between months served and the vote percentages received will add to the scholarship of incumbency, and more specifically, how the discipline of political science views appointed U.S. Senators.
Frederick Hale (October 7, 1874September 28, 1963) was the United States Senator from Maine from 1917 to 1941.
 He was the son of Eugene Hale, the grandson of Zachariah Chandler, both also U.S. Senators.
 He was the brother of diplomat Chandler Hale, and the cousin of U.S. Representative Robert Hale.
Senatorial courtesy is a long-standing unwritten, unofficial, and nonbinding political custom (or constitutional convention) in the United States describing the tendency of U.S. senators to support a Senate colleague in opposing the appointment to federal office of a presidential nominee from that Senator's state.
 The practice is motivated by a general sense of collegiality among Senators and the assumption that a Senate colleague will have the best first-hand knowledge of the personal character and qualifications of nominees from his or her own state.
 It is also viewed as an "important source of political patronage" for U.S. senators.