Stepparents to teens, opinions of your part in their lives?

My partner, so children's step father deals with any issues the same as I would, we all have to live in the household together having said that he's fully aware of my views on things and works to that. As regards to making up new rules without consulting then whether they are a step family or a biological family that should be a big no no in any case, you can't change the boundaries without discussing it first it doesn't lead to cohesive parenting which is the most important thing. Mom shouldn't say no if dad said yes in any family again you have to support each others decisions and discuss them privately if you feel they are wrong not go against each other or the children will pick up on it and just play you off each other. He can give punishments for wrongdoing the same as I would and we then support each other on the decision, we'll also reward as well equally.