Should I try to convince my mother who I am when she doesn't know me. If it's casual pleasant conversation I usually let it slide but then there are times when she wants to go home and cries that she needs to see her daughter. If I tell her that I am her daughter then she will say there must be twins or if you were my daughter you wouldn't treat me this way meaning me not letting her go out the door to wander around looking for her house which happens to be 30 miles away.
It's painful to be forgotten as the primary caregiver, as that has recently happened to me, but, I'm trying to just give positive thoughts and love. Certainly, she can feel that, even if she doesn't know I'm her cousin.
edit: there are some wonderful videos by Teepa Snow on YouTube that can help you understand this part of dementia