As 3 adults living together, it can be hard not to get under each other’s skin. Maybe you could suggest family counseling together, as this sounds like an on going issue and since you live together, it can be a lot, especially as an adult child living with aging parents. If they won’t get onboard, then maybe try counseling just for you. Some couples, like my parents can only communicate by arguing, however it gets me down. It took me a while, but Thankfully therapy really helped me figure out what was worth discussing with them and what wasn’t. It also helped me set healthy boundaries, which have helped me massively both in my relationship with my parents, partner and friends. Sometimes an external professional perspective can really help 💕