L.S.
We are one of those couples. It was really hard for a little bit, but I finally had to sit her dad down and explain that there are consequesces to not being on the same page. Now he has decided I am right, and will usually use my process or ask me what I think before he lets or doesnt let her do something, or before handing out a punishment (he used to never punish, and I dont feel that it is right to punish for something that has happened while I was working or gone when i get back).
I would sit down and talk to him about it! Good luck!