Probably some relative of Mary or Joseph. Mary s prominence indicates a family wedding. It is interesting to see how closely Jesus is associated with His disciples. An invitation to Jesus included His disciples. Others should know that Jesus goes where we go.
Weddings are great places for problems.
Mary handles the problem. She takes the problem to Jesus b. This is a good example for us when problems come, we need to take them to the Lord. We should always be ready to do what Jesus wants us to do. Will involve using something at hand.