At the Central States Conference for the Teaching of Foreign Language, a group with ties to Concordia Language Villages called "Bailemos Juntos" taught a number of dances appropriate to use with students. The first one I have rolled out with my classes is called, "El ritmo vuelta" from the album "Cuba, Si, Si. Vol. 2." which can be found on iTunes. The song and dance are very appropriate for children, but the album cover art may not be.
Ask your child to demonstrate his or her new merengue moves!