Question: Who was the grandfather of the man who passed The Forest Reserve Act of 1891?

Context paragraphs:
Arabuko Sokoke National Park: The Arabuko-Sokoke Forest is located on the coast of Kenya, 110 km north of Mombasa and is protected as a national Forest Reserve.  The Arabuko-Sokoke National Park is only a small portion of the Arabuko-Sokoke Forest Reserve, a few square kilometres in size and is located on the north-western edge of the forest.  The National Park was gazetted only in the late 1980s and in fact straddles the Forest Reserve boundary with about 50% lying outside the boundary.  This outer section actually lies outside an electric elephant fence installed in 2006/7 and is now fully inhabited by local communities to the extent that there is no sign on the ground to show where the National Park begins or ends.  The National Park doesn't add any particular protection to the forest which is the largest fragment of coastal forest (420 square km) left in East Africa, and is an area of high endemism, containing endemic mammals, birds and plants.  The Reserve, however, is jointly managed by the Kenya Forest Service, Kenya Wildlife Service, National Museums of Kenya and the Kenya Forest Research Institute and is one of the better protected forests in Kenya.  The forest was first protected as a Crown Forest in 1943, and was gazetted in the 1960s.  The forest is threatened by the desire for land by local people.  Several national and international conservation organisations are working with the Kenya Wildlife Service to protect the park.

Chiquibul Forest Reserve: The Chiquibul Forest reserve (CFR) lies within Belize's Greater Mayan Mountains.  The Forest Reserve lies adjacent to the Belize-Guatemalan border and as such had been the focus of illegal harvesting of Xate by Guatemalan Xateros.  The Chiquibul forest reserve consists of 59,822 hectares.  The Chiquibul Forest Reserve is bordered to the southwest, east, and south by the Chiquibul National Park, on the northwest edge by the Caracol Archaeological Reserve (CAR), and on the north side by the Mountain Pine Ridge.  The Chiquibul Forest Reserve along with the Chiquibul Park and the Caracol Archeological Reserve compose the Chiquibul Forest.

Western Area Forest Reserve: Western Area Forest Reserve, also known as the Western Area Peninsula Forest Reserve, is a non-hunting forest reserve in Sierra Leone.  The area became a forest reserve in 1916 and has an area of 17688 ha .  It was demarcated by Charles Lane Poole, Sierra Leone's first ever 'Conservator of Forests,' and founder of the Sierra Leonean Forestry Department.  It is the westernmost semi-deciduous closed canopy forest in Sierra Leone.  The forest is home to various endangered species, including a wide variety of endangered birds and Duiker.

Hurulu Forest Reserve: Hurulu Forest Reserve of Sri Lanka was designated as a biosphere reserve in January 1977.  The forest reserve is an important habitat of the Sri Lankan elephant.  Hurulu forest reserve represents Sri Lanka dry-zone dry evergreen forests.  There are many other protected areas situated around Hurulu Forest Reserve viz.  Ritigala strict nature reserve, Minneriya-Girithale and Mahaweli flood plains nature reserves, Wasgamuwa National Park and Kahalla-Pallekele sanctuary.  Carved out at the edge of the Hurulu Forest Reserve is the "Hurulu Eco Park" which offers jeep safaris.

Sierra Forest Reserve: The Sierra Forest Reserve was a federal reserve in the Sierra Nevada, in eastern California.  It was established on February 14, 1893 by President Benjamin Harrison with authorization from section 24 of the Forest Reserve Act of 1891.  It was the largest reserve with over 4 e6acre , and was the second reserve established.  The first was the San Gabriel Timberland Reserve.

Forest Reserve Act of 1891: The Forest Reserve Act of 1891 is a law that allowed the President of the United States to set aside forest reserves from the land in the public domain.  This act passed by the United States Congress under Benjamin Harrison's administration.  Harrison issued proclamations establishing 13 e6acre of land a Forest Reserves; Grover Cleveland proclaimed 25 e6acre and William McKinley proclaimed 7 e6acre .  In 1907 a law was passed limiting the President's authority to proclaim Forest Reserves in certain states and renamed the existing "Forest Reserves" as "National Forests."  A further provision to the act was added in 1939, when President Roosevelt added new standards to the preservation of "Forest Reserves" and "National Forests".  Senator Andrew Dignum, of Massachusetts, and ambassador Bret Rodrigues of the United Nations, contributed to the act by enforcing regulation requirements for clear cutting.

Benjamin Harrison: Benjamin Harrison (August 20, 1833 – March 13, 1901) was an American politician and lawyer who served as the 23rd President of the United States from 1889 to 1893; he was the grandson of the ninth president, William Henry Harrison, creating the only grandfather-grandson duo to hold the office.  Before ascending to the presidency, Harrison established himself as a prominent local attorney, Presbyterian church leader, and politician in Indianapolis, Indiana.  During the American Civil War, he served in the Union Army as a colonel, and was confirmed by the U.S. Senate as a brevet brigadier general of volunteers in 1865.  Harrison unsuccessfully ran for governor of Indiana in 1876.  The Indiana General Assembly elected Harrison to a six-year term in the U.S. Senate, where he served from 1881 to 1887.

List of U.S. National Forests: The United States has 154 protected areas known as National Forests covering 188,336,179 acres (762,169 km/294,275 sq. mi).  The National Forests are managed by the U.S. Forest Service, an agency of the U.S. Department of Agriculture.  The first National Forest was established as the Yellowstone Park Timber and Land Reserve on March 30, 1891, then in the Department of the Interior.  In 1897, the Organic Act provided purposes for which forest reserves could be established, including to protect the forest, secure water supplies, and supply timber.  With the Forest Reserve Act of 1891, the President of the United States was given the power to set aside forest reserves in the public domain.  With the Transfer Act of 1905, forest reserves became part of the U.S. Department of Agriculture in the newly created U.S. Forest Service.

The Chiquibul Forest Reserve: The Chiquibul Forest reserve (CFR) lies within Belize's Greater Mayan Mountains.  The Forest Reserve lies adjacent to the Belize-Guatemalan border and as such had been the focus of illegal harvesting of Xate by Guatemalan Xateros.  The Chiquibul forest reserve consists of 59,822 hectares.  The Chiquibul Forest Reserve is bordered to the southwest, east, and south by the Chiquibul National Park, on the northwest edge by the Caracol Archaeological Reserve (CAR), and on the north side by the Mountain Pine Ridge.  The Chiquibul Forest Reserve along with the Chiquibul Park and the Caracol Archeological Reserve compose the Chiquibul Forest.

Batrakhan Forest Reserve: The Batrakhan Forest Reserve (or Baltyrkan Forest Reserve) is located in Aksy District of Jalal-Abad Province of Kyrgyzstan at the area of Aflatun Forestry.  It was established in 1975 with a purpose of conservation of Siberian Fir ("Abies sibirica" var.  "semenovii").  Among other trees growing in the forest reserve are Schrenk's Spruce ("Picea schrenkiana" subsp.  "tianshanica"), Persian walnut ("Juglans regia"), maple ("Acer tataricum" ssp.  "semenovii"), wild apple ("Malus sieversii"), etc.  The forest reserve occupies 304 hectares.

Supporting paragraphs: Forest Reserve Act of 1891 Benjamin Harrison
Answer: William Henry Harrison