I have a lot to do today but my mom also scheduled for a water heater to be installed today. I am the only one who is home.
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I am quite sure, @Ginnyweasley, Much like the Cable Guy, Someone Needs to Be... Home.
They usually will tell you that someone needs to Sign Something, or Whatever else with even a Bill, and they will Not go inside your Home without someone Being... Home.
Whatever you have to do, Try and arrange your own Schedule to help Mom, Who apparently believes you will be there to Lend a Helping Hand today.
Good luck. xx1