Blessed be Mary, virgin and mother. The Immaculate Virgin, Mary, the most Holy Theotokos, is the one who conceived, carried, gave birth to, nursed, and raised the second member of the Most Holy and Life-Giving Trinity.
God the Father is Our Father. He is the Father of Mary Most-Holy as well. His only begotten son, begotten before all ages, is Jesus the Christ. He is of the same essence as his father. However, Mary is his Mother and God the Father is the Father of them both. How is this possible?
Mary has a tri-fold relationship to the Holy Trinity; because she conceived the Child by the Holy Spirit he has become her immaterial spouse. She is Daughter, Mother, and Spouse of God, for all are one, yet the persons are three. United in essence, undivided in unity, yet three persons. For all are God, and all are Lord, but there are not three Gods and three Lords but one God and one Lord.
Accept the Holy Mystery. Glory to Jesus Christ!