Nothing in any of your comments about incest indicate that you have anything beyond a rudimentary level of education. Step siblings who did not even meet until they were adults do not even give the impression if an incestuous relationship. Step siblings who did grow up together and enter into a sexual relationship may give the impression of it being incestuous, but as incest requires a biological relationship, it is still not incest.
I'm not sure if waiting will help, because not subbing it seems to be a deliberate choice. Apparently viki removed the voice over altogether, so you can't hear that there's unsubbed dialogue. I have no idea why this is happening.
Yes, mental. Us pretending you don't have a serious mental health problem is not going to make it go away. And you don't have a potty mouth, you're just very unwell.