I disagree that a stepmother can never replace a biological mother. I think in some cases, including mine that they can. My stepmum never looked after me any differently than her own birth children and I consider her my 'real' mum even though I still have contact with my biological mother. She does not bother with me much and has always treated me different to my sisters, I suspect because I was very different to her and them as a child and she didn't really know how to relate to me or something. My stepmum was there for me through important and big things when I was growing up (I have known her since I was 10) including when I got married and she was there when my oldest son was born.