DS, aged 2, was playing very happily in the sandpit at a stay and play session yesterday. An older kid (probably around 3?) suddenly came over and snatched the toys he was using, even though there were multiple other toys nearby in the sandpit. I wasn’t sure what to do, so I sat by and let the other child take the toys whilst telling DS that it’s nice to share. DS gave me what was clearly a confused, upset look as if to say, ‘Why have you let this other child just come and snatch the toys Mummy’? I now feel like the worst mum in the world, like I should have taken them back off the other child and stood up for my son. I was just a bit worried about telling off someone else’s child (even though their parent/carer was nowhere to be seen). What’s the best course of action in this sort of scenario?