You do not introduce the groom at the church. He will come out to the right with his best man and ushers behind them and stand by the altar When the bride and groom have been married and enter the reception hall they are introduced by the Master of Ceremonies (MC) as 'Mr. & Mrs.' At the reception there could be a reception line so guests can congratulate the married couple. If you get into a private conversation with another couple who may not know the groom you would then introduce him as your son-in-law John Doe.
