The parents of the Theotokos were Joachim and Anna. They were unable to have children, because Anna was sterile, but they never ever stopped praying and believing that God would grant them a child.
The yearning for a child in faith of St. Anna was very great and for this reason God sent His Angel at the time when St. Anna was praying in her garden, to announce the joyful news that she was to have a child. According to Holy Tradition, the trees and plants bowed down when the holy Angel appeared. (The Theotokos was not immaculately conceived. The teaching of the Roman Catholic Church about the Theotokos is wrong. Because the Theotokos was conceived in a normal, human way and so she was born with the original sill).