It is only necessary in the first years of the method (1 and 2 years). Your presence makes the children feel safe and comfortable in the new environment and they begin to connect emotionally with the language, generating a very special bond that will make their learning productive.
When families stop attending class, halfway through Linda, you should make sure that the children listen to the audio at home on a daily basis and, if you wish, carry out the complementary activities that we suggest.