Title: Gediminids
Content:  The origin of Gediminas himself is much debated. Some sources say he was Vytenis' ostler, others that he was of peasant stock. Some historians consider him as the son or grandson of Lithuanian or Yatvingian (Iazyge) King/duke Skalmantas. Most scholars agree, however, that Gediminas was Vytenis' brother (the parentage of Vytenis is explained differently in various fake genealogies, compiled from the 16th century onwards; according to the latest Polish research, his parentage cannot be established).
Title: Family of Gediminas
Content:  The family of Gediminas is a group of family members of Gediminas, Grand Duke of Lithuania (ca. 1275–1341), who interacted in the 14th century. The family included the siblings, children, and grandchildren of the Grand Duke and played the pivotal role in the history of Lithuania for the period as the Lithuanian nobility had not yet acquired its influence. Gediminas was also the forefather of the Gediminid dynasty, which ruled the Grand Duchy of Lithuania from 1310s or 1280s to 1572. Gediminas' origins are unclear, but recent research suggests that Skalmantas, an otherwise unknown historical figure, was Gediminas' grandfather or father and could be considered the dynasty's founder. Because none of his brothers or sisters had known heirs, Gediminas, who sired at least twelve children, 
Title: Gediminas
Content:  Gediminas was born in about 1275. Because written sources of the era are scarce, Gediminas' ancestry, early life, and assumption of the title of Grand Duke in ca. 1316 are obscure and continue to be the subject of scholarly debate. Various theories have claimed that Gediminas was either his predecessor Grand Duke Vytenis' son, his brother, his cousin, or his hostler. For several centuries only two versions of his origins circulated. Chronicles — written long after Gediminas' death by the Teutonic Knights, a long-standing enemy of Lithuania — claimed that Gediminas was a hostler to Vytenis; according to these chronicles, Gediminas killed his master and assumed the throne. Another version introduced in the Lithuanian Chronicles, which also appeared long after Gediminas' death, proclaimed that Gediminas was Vytenis' son. However, the two men were almost the same age, making 
Title: Family of Gediminas
Content:  Because written sources of the era are scarce, Gediminas' ancestry, early life, and assumption of the title of Grand Duke in ca. 1316 are obscure and continue to be the subject of scholarly debate. Various theories have claimed that Gediminas was either his predecessor Grand Duke Vytenis' son, his brother, his cousin, or his hostler. For several centuries only two versions of his origins circulated. Chronicles—written long after Gediminas' death by the Teutonic Knights, a long-standing enemy of Lithuania—claimed that Gediminas was a hostler to Vytenis; according to these chronicles, Gediminas killed his master and assumed the throne. Another version introduced in the Lithuanian Chronicles, which also appeared long after Gediminas' death, proclaimed that Gediminas was Vytenis' son. However, the two men were almost the same age, making 
Title: Family of Gediminas
Content:  the advantage in establishing sovereignty over his siblings. Known for his diplomatic skills, Gediminas arranged his children's marriages to suit the goals of his foreign policy: his sons consolidated Lithuanian power within the Grand Duchy of Lithuania, while his daughters established or strengthened alliances with the rulers of areas in modern-day Russia, Ukraine and Poland. The relationships among Gediminas' children were generally harmonious, with the notable exception of Jaunutis, who was deposed in 1345 by his brothers Algirdas and Kęstutis. These two brothers went on to provide a celebrated example of peaceful power-sharing. However, Gediminas' many grandchildren and their descendants engaged in power struggles that continued well into the 15th century. Gediminas' grandchildren converted Lithuania to Christianity and inaugurated the first personal union with Poland.
Title: Gediminas
Content:  relationship unlikely. Recent research indicates that Gediminias' ancestor may have been Skalmantas. In 1974 historian Jerzy Ochmański noted that Zadonshchina, a poem from the end of the 14th century, contains a line in which two sons of Algirdas name their ancestors: "We are two brothers – sons of Algirdas, and grandsons of Gediminas, and great-grandsons of Skalmantas." This discovery led to the belief that Skalmantas was the long-sought ancestor of the Gediminids. Ochmański posited that the poem skipped the generation represented by Butvydas, and jumped back to the unknown ancestor. Baranauskas disagrees, believing Skalmantas was Butvydas' brother rather than his father, and that Vytenis and Gediminas were therefore cousins. Gediminas became the Grand Duke in 1316 at the age of 40 and ruled for 25 years. German sources also titled Gediminas as Rex de Owsteiten (King of Aukštaitija).
Title: Family of Gediminas
Content:  Because none of Gediminas' siblings had strong heirs, Gediminas and his children were in a favorable position to assume and consolidate power in the Grand Duchy. Gediminas had at least five daughters and seven sons, whose shrewd marriages helped to consolidate and expand the Grand Duchy's influence to areas east and west of Lithuania. Those marriages speak to Gediminas' diplomatic talent in building alliances with the neighboring states that shared his goals to destroy the Teutonic Order and contain the growing power of Moscow and Poland. The marriages of Gediminas' sons helped to consolidate the dynasty's power over various territories already within the Grand Duchy, while his daughters' and granddaughters' marriages worked to strengthen Lithuanian relationships with neighboring powers.
Title: Family of Gediminas
Content:   It is known that Gediminas, born about 1275, had one sister (or possibly two, see below for the wife of Andrei of Kozelsk) and several brothers: Vainius, Fiodor of Kiev, possibly Vytenis, and possibly Margiris. If Vytenis, who was Grand Duke of Lithuania from about 1295 to 1315, was indeed Gediminas' brother, he was probably the eldest son. Historians recognize one son of Grand Duke Vytenis, Žvelgaitis, who may have died before his father. In 1310 Žvelgaitis, already a mature man, led an army to nearby Livonia in modern-day Latvia and Estonia. After Vytenis died in about 1315, Gediminas became the Grand Duke. There are no sources indicating that 
Title: Family of Gediminas
Content:  1345, just four years after Gediminas' death. Jaunutis tried, but failed, to solicit help from his brother-in-law Simeon of Russia and was baptized as Iwan in the process. He was forced to reconcile with Algirdas and in compensation received the Duchy of Zasłaŭje, which he ruled until his death in 1366. Several sons of Gediminas continued his male line, but it was Algirdas who continued the main Gediminid line. Before deposing his brother Jaunutis in 1345, he ruled Kreva and, despite remaining pagan, married Maria, a daughter of the last prince of Vitebsk. After 1345 he became the Grand Duke of Lithuania and shared his power with 
Title: Gediminas
Content:  Gediminas (Gedeminne, Gedeminnus; c. 1275 – December 1341) was Grand Duke of Lithuania from 1315 or 1316 until his death. He is credited with founding this political entity and expanding its territory which later spanned the area ranging from the Baltic Sea to the Black Sea. Also seen as one of the most significant individuals in early Lithuanian history, he was responsible for both building Vilnius, the capital of Lithuania, and establishing a dynasty that later came to rule other European countries such as Poland, Hungary and Bohemia. As part of his legacy, he gained a reputation for being a champion of paganism, who successfully diverted attempts to Christianize his country by skillful negotiations with the Pope and other Christian rulers.

Question: Who is the father of Gediminas?
Answer: Butvydas.