S.L.
I read your request, the responses to it, and your reply. While I am not a stepmom, I can see your side of the story from (and I hope this makes sense) the point of view of the wife of a step-child. My husband's parents split up when he and his brother were very young. Your husband's ex sounds like a carbon copy of my mother-in-law. My husband was raised in a home with his father, stepmother, brother, and two stepsisters. His stepmother was the best thing to ever happen to him. While she and his father have since split, she is still very close to her stepsons, she is even our next-door neighbor and my brother-in-law lives with her. She raised those boys as if they were her own, and they are now two of the sweetest, hard-working, compassionate men I know. Your job may be a thankless one, but one of the most important. I know if my husband and his brother had been raised solely or even 50% raised by their mom, things would have been wwwaaaaayyyy different. We still keep in touch with her, she has grown up a bit, but still has a ways to go, she also is like dealing with an immature teen, and her sons see that now that they are adults, and father/uncle. I hope you talk to your husband, and he sees the value and worth of your place in the family. Kudos to you, and when those kids grow up, I hope they will thank you from the bottom of their hearts.