The kitchen sink and first floor bathroom were fine, as was the basement.
But the upstairs bathroom, not so much.
Kids, listen, DO NOT TRY THIS AT HOME.
We did, but we are pipe-defrosting professionals, officially certified by our plumber who said, "aim a space heater at that pipe, get yourself a nice chair and sit in the bathroom with a book while the space heater does it's thing. DO NOT LEAVE THAT SPACE HEATER ALONE".
I don't love when my plumber talks to me in ALL CAPS, so I listened. Also, I am pretty sure he was sitting in his bathroom reading a book in his nice chair, watching his space heater defrost his pipes, because everyone, everywhere, has frozen pipes this week.
In case you're wondering - this did work. But it took a loooong time. I read a whole book. And then it froze again the next day, because at some point, you do have to go to bed. I'm so happy I went to the library before this deep freeze started.