My boy was 5.5 and daughter 3. My rules (as negotiated with swmbo) minimum two adults with a ratio of one adult per child after that ( if I just take one child I need a mate to come as well. If taking son and daughter mum and I or mate and I) Never had need to take three kids but I reckon it would be ok two adults three kids. Swmbo would probably have different ideas. Life jackets on at all times whilst motor running. Kids can take them off whilst drifting but must be close to where we are ( ie not stashed in a locker.) The furthest I have taken them is deep Caloundra( 100m line east of Caloundra bar)