Kaplods,
If there is any woman on this entire friggin' board that can think this one through and know exactly what to do about it IT IS YOU! I am supportive of whatever decision it is you have made or are going to make to handle this. Please keep us abreast of the situation.
It would have been difficult but I would have tried not to have even acknowledged receiving it actually. People do some crazy crap and this one definitely deserves taking note. I think the letter says NOTHING about you or hubby. I think it says EVERYTHING about the mother. What does she want? Applause for having lost weight--or some constant reassurance saying, "Yep, we're fat and you're skinny?" I say to definitely consider the source above all else. Is she someone your hubby and you have a deep, intimate relationship with--someone you implicitly trust and know has your best interest at heart? If not, issue a cease and desist order to the old bat and move on.
The letter pisses me off and I am only reading about it!