Where did I say anything about SW's?!
I would have intervened if it was a safety matter, of course. I'm not going to stand by and watch a child, any child get hurt or abused if I can step in.
What I AM saying is that PARENTING DECISIONS should be taken by the mum and dad of that child. Bedtimes should be consistent in both households, rules and acceptable/unacceptable behaviours should be discussed by the mum and dad of that child.
Consistency for the child should be the first thing thought about, whether the parents are in a relationship or not.
I really don't see parenting decisions as anything to do with anyone else that I might be in a relationship with, or anyone else that their dad might be in a relationship with.
It is a stepparent's job to care for the children and to follow the wishes of that child's parents. It's the ethos I lived by when I was in a relationship with someone who had existing children, and it's the ethos I expect my DC's father's new partners to live by.
DD's SM is brilliant. I love her to pieces. She respects the decisions that me and DD's dad make, she phoned me and asked if it was ok to take DD for her first manicure, she goes out if her way to be kind to DD and respectful of the fact that I brought DD up with no input from her father (his choice, he took a long time to grow up, SM had issues with this with THEIR first DC too...) for the first 12 years of her life. I luffs DD's SM, and I KNOW that she would never make parenting decisions wrt DD.
DS1's SM - totally different. She gets his hair cut against his wishes, leaves him out, tries to get over involved in his schooling (turning up to PARENT'S evening, wtf?!), punishes him in ways that are inconsistent with those that had been agreed upon between my Ex and me, and then to top it all off, raised her hand to hit him (and would have, had his Sbro not pulled him out if the way), and left fingertip bruising on his arm. He no longer has ANY contact with her. He is seeing his dad, I'm happy to continue to facilitate that, even if the odd days and times are ALL to suit his dad and are messing with my plans. I DON'T like her.
So I'm not against SM's in general. Just the ones that overstep the mark, and don't respect that PARENTING decisions should be made by that child's PARENTS.