Dear Chrystiane,
I have a few suggestions for you. The first is that you need to let go of the past. Your mother is not competition for your husband's affection. She may well be in diapers in the not too far off future. I would strongly urge that you see a counselor or therapist to resolve any past issues you may have. Caring for a loved one with Alzheimer's is trying enough without carrying around a burden from the past.
Does your husband give you any reason to believe that he is tempted to take your mother up on her "offer?" If so, then marriage counseling is in order. If not, then discuss with your husband some techniques for politely brushing your mother off without being mean. Perhaps if he responds, "Chrystiane and I love you too, Mom" might be a good solution.
If you've ever had kids, you know that they can say things that you can feel pretty bad about, such as "I hate you!" But that's only if you give those words power over you. That choice is yours.
My grandmother who had Alzheimer's would occasionally accuse me of being "the other woman" and trying to "steal her husband away from her." I just reminded myself that my grandmother had a disease from which she would never recover, and that she would continue to get worse. Whether or not she knew who I was, both she and my grandfather needed me. So some days I became my cousin, some days I had to introduce myself to her, and some days I was a spiteful woman of ill-repute.
Best wishes and don't be shy about writing back and letting us know how you're doing. You can also check out the
Alzheimer's Exchange if you haven't already.
Byroney