3 children usually means every light in the house left on, in rooms that nobody is using of course, TV's and music playing away to the sofa and tablets / phones ( if they are old enough ) on charge pretty much all of the time.
Older children in the shower for at LEAST thirty minutes.
Then the minute you turn the lights back off, they suddenly appear to turn themselves back on just like magic.
Been there - done that Mark !.
I always find it strange, that when they are old enough to afford there own property, they never seem to leave any of the lights on, in rooms they are not using......... Strange ?????.
Go figure !.
It's all okay when "Dad" is paying the bill, but that all soon changes.
My Dad use to say to me :- "As they get bigger, so do the problems".
How right he was ( bless him ).