She is awful. I know what he does for them. We both treat whatever they have, but they don't live with us, they live with her, which is why I think she should be looking after them better.
I started out moaning about the stepchildren's mother not looking after them better, however I'm now being vilified for not paying her maintenance. They aren't my children, it would not be appropriate for me to be anything other than a step parent, offering care, shelter, clothing, food, well being and emotional support if they need it, they have a mother, I think she could do better but she's still their mother, not me.
Step parenting sucks, you get the responsibility, financial and emotional, the crap from them and their mother, no upsides as far as I can tell, they are really nice kids, I'm very fond of them, but if dh and I did split up, where would that leave me with them? Nowhere, I have no rights over them, my lo would lose siblings, I might never see them again, yet I still provide for them. I don't begrudge it them but I do begrudge the expectation that I should be trying to make her life better. Not my problem, that's between her and her ex. For their sake I wish their mother would get her shit together. I would also like if they would remember to wear socks.