Holiday resort, DS1 is 4, 5 next month and is currently running round playing with three other little boys of similar age, possibly closer to turning 6. DH has gone into one of the bars off the main patio terrace area (which is fairly large - currently sitting around 60 people and barely half full) with DS2 who wants to dance to the music they have in there. I'm not comfortable leaving DS1 out here alone with the other boys, even though obv he'd know where we were and I'm not currently doing anything other than keeping half an eye on him from about 50m away. As far as he's concerned he's doing his own thing. DH thinks I'm being ridiculous and DS1 would be fine with check every five minutes and clear info about our whereabouts. I think 4 (even almost 5) is too young to be left without parental supervision in a place full of strangers and with ready access to swimming pools (even though we're not near the pools - they could take it into their heads to do anything at all in five minutes!). Just for info we're not arguing about this- just agreeing to disagree - but I'm wondering which way mumsnet as a whole would lean.