Minor children of the Bride and Groom are often included in the wedding ceremony as the wedding marks the beginning of a new family, not just the union of a couple. A gift of recognition is usually presented to the children as part of the wedding service. This could include a ring or other gift that would have meaning to the child. One couple, each in their second marriage and bringing children to their marriage, called their four to the altar and presented each with a beautiful, engraved key chain and a key to their new home. The engraving included the name of the child and on the other side "The Door is Always Open." It was a beautiful and welcoming gesture to their children, who may have had some mixed emotions at seeing their parent marrying again.
Other ways to incorporate your children include: nominating them to be flower girls, ring bearers, junior Bridesmaids or ushers; or if eight years old or older, having them be your Best Man or Maid of Honour. You would need to choose an adult to sign the marriage license, as you have to be 19 years of age to sign a legal document. Regardless of their role in the ceremony the children can be included in the signing of documents. Most Officiant / Ministers have a separate document that the children can sign along with their parents.
Another role for the children of the Bride or Groom might be to escort their parents into the ceremony. During a second marriage many brides choose to have her son or daughter escort them down the aisle rather than have her fathers perform this duty a second time. Other tasks the children can be given are tend the guest book; distribute the programs and/or the rice or petals before the Bride & Groom leave.