You may use less if you don't clean the cache, that way things won't need to be reloaded and files re downloaded.
I feel your pain, I have 4 teenagers, 4 adults, 6 desktops, 8 laptops, 2 ipads and netflix, plus 1 dog who does not use up bandwidth, just space.
I'm on a metered account and 100 GB is not enough.
Not to mention that I feel the need to hire an IT guy for the house.
"1946-09-01 - 1st US Women's Open Golf Championship won by Patty Berg"