Roto-Rooter to the Rescyoo

It's Sunday night before Marlene's first day at work. Sewage is coming out of drains in our house. We're sitting waiting for Roto-Rooter. Time to fire up the bbq and sit in the backyard. Yay house! I hope this can be solved with simple plumbery and not complicated trenchery. That can of chemicals to clear root-obstructions that was high on a shelf when we moved in is now haunting me....