Иван's father is Кирило Сидоров and his mother is <Unknown>. His paternal grandparents are Марко Матвеев Сидоров and <Unknown>. He had two brothers named Тимофей and Демитрей. He was the second oldest of the three children. He died at the age of 62 on December 8th, 1768 in Тугулымия.2