Ever wonder who Jesus' grandfather was? The grandfather of Jesus was Mary's father, Saint Joachim.
Saint Joachim was married to Saint Anne and father to the Virgin Mary. He was a descendant of David. Anne and Joachim had difficulty conceiving a child, but very late in life, as a miracle pregnancy, Anne conceived Mary. An angel appeared to Anne and Joachim and promised a child. The belief was that due to the rare nature of Anne's pregnancy, their child would go on to do great things.
His feast day is July 26th. He is the patron saint of fathers, grandfathers, and grandparents.