It ain’t easy guys! You gotta work on those communication skills.
I won’t get tired of repeating it. You are together with different people, different ways of thinking, different backgrounds, and even different religions.
Communicate.
Something bothers you. Communicate.
You like something. Communicate.
Tell them to communicate with you too and it’ll all be good yeah.
Imagine your polyship being made up of supernatural/mythical/otherworldly creatures who are new to human society, and the sole human of the group has to constantly be keeping the others from wandering into traffic, getting caught up in the mafia, etc etc.
A and B and a couple and C and D are a couple, and B and C start dating. The only problem? A and D are enemies and hate each other with a burning passion, and are now being forced to interact.