This type of environment, and OPs reaction to it, is how people develop compulsive behaviors that are unhealthy. You can hear it in how they talk about even simple things, like their extreme disgust towards saliva deposited in a trash can. Revulsion towards saliva in a trash can is not normal. Saliva left on a surface? Or on their person? Sure, gross. But a trash can is an appropriate place for someone to spit. It doesn’t deserve the vehement disgust OP displays.

I’m not diminishing how unhygienic and disgusting their family is. The photos make it clear that they live in a completely inexcusable level of filth. I just don’t want OP to continue down this path of obsessive, compulsive cleanliness. There’s a happy medium.