I get this reaction from my parents. It's scary. They will give nonsensical or conflicting answers to basic questions about day-to-day stuff, like they are not consciously aware of the question but are programmed to respond. I can't count the number of times I have been told complete lies to my face about the weather, directions, whether the washing machine is in use, etc.
Sometimes they contact me, and they don't acknowledge my responses. It's like I'm invisible. Whenever I straight up ask about this or try to talk about anything in general really, they instantly get extremely upset and evasive. It usually escalates into yelling and my father likes to go into a blind rage and shout orders like a police officer, but the clearest answer I've gotten is that I appear to be speaking a different language to them. What's telling about this is that they won't even look me in the eye or try to figure out what I'm saying, so unless I'm holding a fucking gun to their heads they treat all outside stimuli like it doesn't exist.
I can't receive this answer without them first becoming completely hysterical, so maybe they are just spewing it as an excuse to rationalize their detachment from reality. I have never seen someone get so thoroughly agitated by asking them about their plans for the week. They literally have no thoughts at all. It seems like they are barely motivated to eat or drink outside of ritual behavior and general gluttony, so they buy nonsensical health foods and then overeat. I'm worried about what's going to happen when their filthy obese bodies shut down because I have never held a full conversation with any of them for my entire life.
I can't take care of an elderly person I barely know, and how am I going to arrange a funeral for someone I don't know and contact family members I've never met or even heard of? It makes me want to completely disappear but it's like leaving an infant alone in the woods.