Biological mother - horror and revulsion mixed with some empathy. I understand why she became what she became but knowing her has been an extraordinary motivator to do better.
Foster mother- an ice-cold wish to treat them the way she treated me. They wouldn't like it <dry smile>. I understand neglect happens but 'boredom with the baby' is a very poor reason. The physical and mental effects of shortish but severe neglect as a tiny baby have been lifelong.
Adoptive mother - gratitude that I had a loving and good mother for 8 years. Aching loss for her, all these years on. I miss her, and I miss the love, stability, interest, healthy discipline and care she had for me. I miss her just as much now as then, just in a different way. She is, or was, my real mother. Blood does matter, but the choice to love and care for a child, consistently, lovingly, well, matters more. She mattered, so much. I love her.
Stepmother - Fear. Betrayal. Hate, though I've tried to let go of that for my own sake.