Re: Please Sir/Madam, stop using my bathtub!
@LadyAofPineapple it's a while since I used butlers properly in my game because I kept getting elders who just didn't do much and complained about their bad backs even more than I do, seriously I was yelling at the screen "here, take my heat patch and stop your whining".
But, in the houses where they were I created separate ensuites for each Sim, including for the parents who got one each, leading from the master bedroom so they didn't share. Then I locked each bathroom door and attached bedroom door for that individual. I had to do it for Sims using the wrong wash basins too recently as everyone was walking in on everyone else. I also placed a couple of regular bathrooms for guests (and because it was about 5 storeys high). The ensuites obviously couldn't be cleaned by staff but as they were rich I just replaced stuff in BB mode when it got dirty, because...champagne problems!
I also found that they didn't really use their quarters. I'd make a self contained apartment with a little kitchen and everything but they were not appreciative. I mean, it was in the sub basement next to the home cinema and the vault but still that's just ungrateful.