Is the other child my husband of thirty years who visited mom with me in December? I choose not to ask mom who she meant, because she has told me every day that she cannot remember anything. So there is no need to upset or maybe frustrate her.
My mom seems to not have much of a long term memory either. Whenever she says something about having no memory what I always say to her is ; "Mom you remember how much I love you " and mom answers" yes I do". So I then say "mom you have a memory" and we both laugh. I think it's better to keep things light.