OP, for a moment there I thought I’d started this thread myself.
Yes, my dad used to hang around the bathroom, when I was around 12ish especially. I think he used to try to be in there when I was getting ready to get in the bath, ie undressing or wanting to undress, and he’d pick that time to try and have a “chat”. Never very interested in chatting to me otherwise.
We had a lock on the bathroom door but no one ever locked it, it was like an unwritten family rule that we just didn’t do that.
Once when I was 12, I’d been sunbathing in the garden and I think there was some kind of row with my dad, and maybe my brother. I went upstairs to have a shower (and probably to get away from him/them) but I must have had a feeling my dad was going to come after me - I remember deliberating whether to take my swimming costume off or not, and deciding to keep in on, just in case.
Sure enough he came in. And marched over and pulled the shower curtain right back, while I was in there. Even though I must have half expected it, I still remember the shock; he wouldn’t have known I still had my cossie on. But he did it anyway.
I started locking the bathroom door after that, although it had frosted glass panels all the way down so I never felt really secure in there, and used to slide down inside the bath as deep as possible in case anyone (he) came past.
My mum just moaned at me for locking the door, supposedly because she couldn’t get access to the airing cupboard while I was in there any more.
This one episode, and another worse one, stand out against a backdrop of years and years of feeling watched and creeped on, and low-level boundary violations. As others have said, it really messed me up. It really is horrible not feeling safe, or respected, in your own home, among your own family.
Thoughts with all those who went through similar. Sad how many of us had dads/stepdads/brothers etc who couldn’t be trusted.