My parts don't seem to like each other much

My therapist is prompting me to start developing better internal communication between my four parts, and I'm having a lot of difficulty with it. None of us feel like a 'host' or 'original' identity. We see ourselves as being more like sisters than parts of a whole, but our overall self-conception has been changing since my therapist first mentioned DID, so I'm not sure how to define 'us.'

I've been trying to pay attention to internal cues and changes both from the fronting part and the other parts. I'm very new to this, and we switch often, but I'm noticing that most of the internal messages seem to come from the part who is in a caretaking-type role. That part feels a need to keep the other parts in check, and I'm noticing that the other parts don't like her very much. She seems to give us a heavy brain fog when we do or say something that she doesn't like. She makes us feel guilty for wanting different things than she wants.

How does internal communication work for other systems? We don't hear our voices. It's more like separate streams of thoughts, plus sensations like brain fog and self-consciousness. How can we start to work together without getting frustrated with each other?