1. Go to the house with bad plumbing.
2. shortly thereafter, declare yourself ill, and say that for the sake of them all, and at great personal sacrifice, you are going to self-quarantine in the bad plumbing house BY YOURSELF.
3. Use a bucket.
4. Enjoy peace and quiet until this is all over.
With all those kids and family in the house I will suggest a large roll of duct tape could solve the problem at least for a few hours until they managed to get loose. Use the good gorilla tape for some extra quiet time.
Usually the second time you tape them into a chair with a used gym sock taped in their mouth they will get the message.
Chig is 21 years old and has never even been on a date. Her school work is her boyfriend, I guess. She made the announcement a few months ago that she is never leaving home.