The ushers and/or groomsmen escort the grandparents of the bride and groom to their seats.
The ushers and/or groomsmen escort the mother of the groom and mother of the bride to their seats.
The bridesmaids enter, escorted by the groomsmen.
The maid or matron of honour enters, either by herself or escorted by the best man.
The ringbearer or page boy enters.
The flower girl enters. (In some ceremonies, the ringbearer will accompany the flower girl.)
The bride then proceeds down the aisle, escorted by her father, to the accompaniment of music (usually the wedding march, often called "Here comes the bride"), and the ceremony starts. - See more at: http://www.learnenglish.de/culture/marriage.html#sthash.dw8gVsh7.dpuf