I think its lovely when people don't distinguish between step children. I know if I were a step mother (providing the children didn't mind) I would always refer to them as my children regardless of of our family situation. I think of it in the same light as neices and nephews. I am an only child and therefore I technically have no neices or nephews, however I call marc's neices and nephews my own, I never introduce them as marc's or my husbands iykwim? I think its lovely that you've thought about this, and I think this sort of thing will only help pave the way for a longstanding loving relationship with your beautiful children

*hugs*
Cailin