Why is it that when a mum moves in with a man there is an immediate expectation that he takes her and her kids on and he contributes to the whole family yet when it is a dad moving with a women, there is a question as to whether they should contribute a penny?
oh swing why do you feign ignorance so much? you comment on nearly every single step parenting thread so lets not pretend you are naïve.
Its usually 2 different scenarios, because usually women are RP's and men are usually NRP's.
If you get into a relationship with someone who is an RP, you know that you will live with their children at some point, so you go into it with your eyes open. You are agreeing to live FT with kids that are not yours. However, I still don't think you are, or should be expected to contribute directly to those children unless you want to, however a lot of the time things like tax credits or UC will be affected by a second adult or wage in the home, so you have no choice. You presumably know this and agree to it before you move in together.
When you get into a relationship with someone who is an NRP, you generally see their kids every so often, you have no expectation that you WILL live with them (though there's a possibility) the costs for these children are mainly maintenance which is paid to an ex partner - you don't and shouldn't expect to contribute to that. The rest of the costs eg food, clothes, going out whatever else, again I think you should contribute if you want to but shouldn't be expected to.
being in a relationship with an NRP is entirely different to being in one with an RP. Of course it is. The dynamic is completely different, the implications of you moving in together are different, finances will obviously be different.
I wouldn't expect anyone to contribute towards my child except his other parent tbh.