When I was really little (about 4) my big brother was in the elementary school choir and at Christmas time he came home singing the Wassail Song. I loved it so much that he taught it to me. When I went to watch his performance I sang right along from my seat! It is a wonderful memory, so it wasn't hard to decided what my two young carolers should be singing.
Something new for this holiday season, with the love children have for singing, dogs and snow! May love and joy come to you!