Allow your children to come up and sign part of the official documents at the signing of the register. your officiant will give you 'the record of marriage' part of the license and anyone can sign, print or make their mark (for the younger ones)
Unity Sand Ceremony- a must! His mother carry the black sand down your mother the white and go ahead and have pink sand down there for the children to pour into your unique jar.( have it with a cap for the sand not to fall out incase of accident)
Have a ring warming ceremony to take the ring exchange one step further. Before the ceremony, pass the wedding rings around to the guest who imbue the rings with a silent prayer or blessing for the couple.