I love the pedantry of children, one of our children complained quietly to me that a visiting priest didn't say the Traditional Mass right, "He said, "miserere nobis" the third time in the Agnus Dei, instead of "dona nobis pacem". The same six year old went off and learnt the Alma Redemptoris when someone mention that it, rather than the Salve, should be sung during the Christmas season.
A friend gave one of his 11 year old servers some Fr Peter cards for Christmas within few days it was all cut out and he was 'playing' Benediction and Missa Cantata in his bedroom, probably with reference to Fortescue. It was his favourite Christmas present.
I was sent photographs but I am having difficulty putting them online.