One thing that just p***** me off/upset me a bit is I just said to D4 that I'm scared, I don't want to go. D4 said 'you have to so mommy doesn't have to fight no more with you'. I asked her, 'did mommy say that to you?' D4 said 'yes'.
You shouldn't tell your daughter things like that. That is you being the child and putting a 4 year old in the role of the parent. Do not lay that trip on your daughter. You can't do anything about what your wife says to her but at least be accountable for yourself.