Кирило was born in 1727. Кирило's father is Кузьма Осипович Букин and his mother is <Unknown>. His paternal grandparents are Осип Фёдорович Букин and <Unknown>. He had two brothers and two sisters, named Иван, Василей, Ульяна and Меланья. He is the second youngest of the five children.