totallyyyyyy understand when a child's behavior affects the entire family. Our therapist says to use consequences that make sense to the crime.
ie: talking back when getting off screens=no more screens, screaming about pajamas= going to bed 20min earlier the next day, bed time stand off= nothing fun in her room.
This is clearly over simplifying it and you may have already used these strategies. It's so hard. Hang in there. I understand needing to do whatever you need to do to get through.