Joachim and Anna could not have children. Anna was barren. The Bible mentions several times the birth of significant people by barren women. Isaac, the son of Abraham was conceived by the barren Sarah, after the announcement of the angel. Prophet Samuel as conceived by the barren Hannah, by the word of Prophet Eli. John the Baptist was conceived by the barren Elizabeth, after the announcement of the angel.
Unless otherwise specified, the articles here are posted by Father Aleksey, who has no sense of humor and is extremely straight forward.