I have always understood that Jesus received His “human form” because Mary was his mother. This would lead me to believe that yes, one of Mary’s eggs were fertilized by the Holy Spirit. Jesus was “conceived by the Holy Spirit” (as per the Apostle’s Creed) not deposited fully developed into Mary’s womb. This would mean the Joseph was His foster father.
Remember, Joseph accepted his role once God outlined it to him, just as Our Lady did. I think that there may be revealed to us - in the future - more ways to honor and respect this incredible man. However, always remember that Mary took the biggest risk in accepting her role as the Virgin Mother of The Lord. It was she who could have been put aside by Joseph, she who could have been stoned to death for being pregnant outside of marriage, she who bore the pain and suffering of pregnancy and childbirth all because God asked her to - with the only promise being one that she too would suffer along with her Son.
To my way of thinking, both of them are incredible - but Our Lady must have had steel for a back bone.
Or maybe I am just easily impressed?
LOLOLOLOL