Dh's mum is nanny. She and Grandad are in their 70s. DD is having a sleepover party soon, and I suggested ds (6) and sa (3) went for a sleepover at nanny's. However, older ds reacted sadly/ crossly etc and adamant doesn't want to go. Last time (and first time) (cple mths ago) he apparently kept everyone awake - Nanny told us this, as well as being cross he didn't eat much cooked breakfast. It now turns out (via dd and ds) that he was punished by being sat in the dark on the stairs for 20 mins after Nanny and Grandad went to bed. Nanny told him if he was quiet and stopped crying he could have his bedtime animal back. What do I do? I don't really want to send him again...