From the sound of it, you've all reached a reasonable compromise and sanity restored. The new shower will actually be an 'asset' improvement, hence a good investment, so there's that too.
These days, things are not so easy as they were for older generations and our young people often need more help than we were accustomed to. Even so, have faith....they all fly from the proverbial nest eventually (and sometimes they come back ) 
Please help! (grandchild being locked in bedroom)

