Ask your family to set the furnace temperature lower and the air conditioner higher. Sweaters, open windows and fans will work just fine most days.
Unplug appliances that are not being regularly used. Many electronic devices still draw power even when turned off, sometime known as “vampire” energy drain.
Many states now allow residents to choose their energy supplier. Talk to your family about choosing a supplier that produces electricity with less pollution, via solar, wind, and other options.