It happened a long time ago and the DC involved is now an adult, with no apparent long term harm but I relayed this story to a friend, who was horrified. I was telling the story of a lovely grandad who did things his own way but who the DGC benefited enormously from having in their life.
DS was about 2yo and my DDad was minding him one day per week while I worked. Dad is a bit eccentric but he's very capable and adores his DGC.
I got home one evening to find DS in his nappy and DDad in his underpants with the heating turned up high. DS had been sick a number of times (which I knew nothing about until I got home) resulting in numerous clothing changes and DDad had decided not to create any more washing.
Unusual but not sinister, or is it?