Sorry but I've got a much less interesting dilemma.
Basically my kids are 8 and 6 and they treat their mum like dirt. They talk to her like something off their shoe. I don't know where this has come from (my suspicion is from school) but I only have to lower the tone of my voice and the kids know that they've crossed a line and to behave.
For my wife they will play up and play up, tell her to shut up and often times I will come home from work to a full scale riot. To top matters off my wife is unwell, she is losing her eyesight and suffers from M.E.
I've told her to toughen up around the kids and have some bite to go with her bark but I think that when I'm not there that she doesn't follow through with her threats (confiscation of toys/tablets, sent to bed etc).
It's just frustrating, I work in construction with some utter morons so I come home exhausted and have to play UN peace keeper. We are both at our wit's end, if she goes out the kids are great, no problem, do their teeth themselves, do their homework, eat all their dinner etc. As soon as mum is around it completely changes.