There are two child-friendly Great Thanksgiving Liturgies that have been authorised by the Anglican Church of New Zealand, Aotearoa and Polynesia. These are great for using with families and children.
Source: Alternative Great Thanksgivings for The Liturgies of the Eucharist / Nga Hakari Tapu (confimed by General Synod / Te Hinota Whanui May 2010). Used here with permission.
Welcome to the Lord's Table, first published in 1999, covers all the key elements of what it means to be on the Christian journey and helps the child, together with his or her family and the congregation as a whole, to move towards the child's Holy Communion. The material is divided into ten units, with four opportunities to mark the journey with the worshipping community as the course progresses. The course book contains revised information concerning Child Protection and CRB clearance and has relevant contact information and website addresses. An activity book for the child to own and complete accompanies the course book (see sample pages here)
An article about using liturgy at Messy Church