Teaching solfege to mixed ages

Yes interesting for sure. These hand movements are more extreme than what my girls learn at school. They go much higher and lower on the body. Ours are the same signals but they are between the lower belly and the eyes. I think both my girls can easily learn the first set perhaps playing around with it bit with my son (3) would be a good idea eventually he will start to copy the girls anyway. I wonder how long it will take me to learn to sing with hand signals? I doubt this will come easily for me....

Nadia, thank you very much for sharing this information with us! I think that this approach is focused on teaching kids singing songs with no intention to teach them instrument, especially piano. It is maybe fun to have it as an extra activity for small kids, but later on won’t be as beneficial as playing piano and singing Solfeggio at the same time.
With Soft Mozart your DD will be exposed to many different piano pieces and she will develop her sense of tonality and music hearing most effectively and directly.