Water back up in basement shower when shower upstairs used and when
Washing machine used?
Please give me some input this area seems to be short of plumbers
Basement, main floor and top floor house .
Thanks ducky 70

It would appear you have a stoppage in the drain line after the basement shower. Find the cleanout and rod or auger the line. You may find it out in the yard, tree roots etc.

Hi ducky and welcome to The Plumbing Page at AskMeHelpDesk.com You do ,indeed. Have a blockage. But first clear this up.
basement, main floor and top floor house What are you trying to say? Back to you. Tom