Question: why would my mother ask me for my social i.d. number so she can put me in her will? 

Answer: I'm an attorney, so I'll try to give you an intelligent answer, unlike some of these others. From what you've stated it seems that your being placed into her will as a beneficiary, or other things. \n\nIts mainly used to help identify people after your mother has passed away. If its bothering you go speak to her about it.
This question from the Yahoo Q&A forum is categorized in the topic: Family & Relationships