Lav first then toilet then tub only bathroom in the house doi g this

when you flush toilet it starves water to sink and tub
this is a volume, issue cause by undersized piping or a blockage in the feed. Did this just happened or has it been ongoing? How old is your home and what material are the water pipes? Could they be galvanized? Back to you, Tom

this is a volume, issue cause by undersized piping or a blockage in the feed. Did this just happened or has it been ongoing? How old is your home and what material are the water pipes? Could they be galvanized? Back to you, Tom

This is brand new home pex piping I was hoping u would answer this you are very knowledgeable when toilet is not flushed they work fine