Short answers, pulled from the story.
Kuzma Minin was a Russian merchant and butcher from Nizhny Novgorod who, together with Prince Dmitry Pozharsky, organized the Second Volunteer Army that expelled Polish-Lithuanian forces from the Moscow Kremlin in 1612. He is celebrated as a national hero in Russian culture and is honored alongside Pozharsky in the Monument to Minin and Pozharsky in Moscow's Red Square.
Minin oversaw the handling of public funds donated by the merchant guild of Nizhny Novgorod to raise and equip the Second Volunteer Army. He was chosen for this role because he was a trusted and respected member of the guild. Military command of the army was held by Prince Dmitry Pozharsky.
The Second Volunteer Army cleared the Moscow Kremlin of Polish forces on the 1st of November, 1612. This ended the Polish-Lithuanian Commonwealth's occupation of Russia's capital during the Time of Troubles.
Kuzma Minin was interred in the Archangel Cathedral of Nizhny Novgorod after his death on the 21st of May, 1616. A central square in Nizhny Novgorod is named after him and Prince Pozharsky.
Tsar Michael Romanov elevated Minin to the nobility and appointed him to the boyar duma, the council that advised the tsar. He was also honored posthumously with the Monument to Minin and Pozharsky in Moscow's Red Square.
A royal decree dated the 5th of July, 1616 confirmed that Minin's widow Tatiana Semenovna and son Nefed inherited an estate including the town of Bogorodskoye in the Nizhny Novgorod district. Nefed died in 1632 and the lands reverted to the crown before passing to Prince Jacob Kudenekovich Cherkassky. Tatiana Semenovna eventually took monastic vows, most likely at the Resurrection Convent in Nizhny Novgorod.