My friend asked more about my situation and I went on.
"My belief is that, as grandparents, our advantage in that we have already brought up our own kids. We therefore have a head start on knowing the approximate developmental patterns of babies/toddlers and pre-schoolers.
We already know in advance that our grandkids are not going to stay in any one stage for long. They are always growing, learning and developing. Just when we think we have got it right they change. If we are going to keep them engaged, we have to be one step ahead. I have learnt that kids love puppets, they love movement, singing, and as the Bee Gees so nicely put it 'You should be dancing.' Music, dance, singing and banging on things all go hand in hand for little ones."
"Oh, of course" my friend responded, "I was a school teacher. I know lots of music and craft ideas we can share."
"Well maybe we can share some ideas together?"