chargers
Is there an all in one charger for iPhone, Watch and iPad?
Apart from that iPads don’t charge much from the 5watt AC charger then they can all share all AC chargers
if you can find an AC chargers with 3 connectors and can provide enough watt you can use that to charge them all at once.
Watt is like how fast your car can drive, but the speed limit is how fast your car do drive
the iphone draw as much current as it was build to use when charging, the fact that a charger can provide a lot more just means it's not having its full capacitive used