whether Mary had other children with Josef after the birth of her first Son, it is her first Son (and possibly only son) who has redeemed us.
the example of Mary is one of humble submission to God's will for her life, and being chosen for the blessed and wholly unique task of bringing Messiah into the world as a human child. she is the only woman to have brought a child into the world through the Holy Spirit, and was there at our Saviour's birth, dedication, flight into Egypt, childhood, ministry, death upon the cross, and empty tomb. she is certainly unique and blessed, but as she is not God, she does not play a personal role in my Christian life.
one can find many reasons to honor Mary, venerate her, hymn her, and adore her. this is a reverence i reserve for God's Son, and for God the Father.