Why should anyone that ISN'T a child's parent get any say in parenting decisions? I wouldn't think that I could have a say in when my siblings choose to potty train their children. I wouldn't 't think that I got a say in when my friend's children were potty trained. Nobody would think that a childminder would have a say in when a child was potty trained. I wouldn't listen to my parents if they told me my child should be potty trained.
I just can't see why a PARENTING decision like this has anything to do with ANYONE except that child's PARENTS.
When I was in a relationship with a man who had children, I loved them (still do), I cared for them, I held them when they were crying.
I did NOT have any input in the time when his younger DD was potty trained, or when she needed her hair cut, or school choices.
It just wasn't my place. Those issues were for her PARENTS to discuss. I accepted those decisions that were made by her PARENTS.
I was not her parent - I may have been a significant adult in her life, I may love her, but I was and am not her PARENT.
Her PARENTS decided that she wasn't ready to be potty trained at 2.8yo. I disagreed, but I kept that to myself. Because it wasn't, and never would be MY place to make that decision.
In the end, her parents decided that 3y was the right time to PT her. Though she had other ideas and took her nappy off at 2y10mo and was instantly dry day and night.
I may have been right that she was ready for PT, but I would have been WRONG if I had gone ahead and took her out of nappies IYSWIM. That had to either come from her or her parents. Not me.
So I DON'T feel I have any sort of an attitude towards SM's, OR Ex's new partner's, what I have an attitude with is someone trying to make something their decision when it isn't.
How many people would be totally
if their MIL took the decision to take their DC out of nappies? Or their childminder. Without their agreement? How is this ANY different?
It's a PARENTING decision, to be made by the child's PARENTS.