I have 4 children and my eldest has a step mum and his dad had 50/50 with them while he was growing up.
Step mum was the more dominant of them and he always ran things past her and even his dad would say ask step mum, she was definitely the decision maker in their family and always very involved, needed to know everything and had to ok everything.
I think I feel like I shared him with her a bit and he had two mums, she definitely referred to him as her son and didn’t have any others.
I have always felt this put a bit of a barrier between me and my son and I am closer to my other 3 that I had full time with no step mum and I’m their only mum.
They are adults now but I just wondered if anyone else had felt this way.