I wish that I had the opportunity to interview you and your mother to learn more about this situation. There could be many reasons why she’s lying but, without knowing you or her personally, the following ideas are speculative.
It’s possible that she is misremembering. Perhaps she’s having difficulty with her memory. I don’t know her age or her medical condition, but memory problems could be present.
Perhaps she has been reading about religion lately and has been feeling guilty about not having raised her children with religion. It could be her way of attempting to correct the past.
I could go on and on with potential guesses, but unfortunately guessing is all I can do with so little information. If I were able to speak to you, I would want to know if this type of behavior is outside of her character? Has she ever lied about other matters in this manner? Is she a melodramatic individual? People who have a flair for drama might do or say these sorts of things.
You know your mother best. If this is how she is, and it bothers you, then you might consider limiting the time you spend with her. If you think a medical problem is present, then have her evaluated by a physician. Beyond that, it’s not clear to me why she would behave in this manner. You might consult other family members who might have more insight into her personality and this problem. Good luck. Please take care.
Dr. Kristina Randle