you have'nt failed, and while i know your sil has done a hatefull thing regarding the comments about your illness (none of my sibs or il's have said it to my face but i KNOW some question the validity of my illnesses-but they only 'hear' about the bad days-good lord, it would never occur to them to offer to maybe take the kids to the park for a couple of hours so i, or moreso dh who pulls the full weight plus cares for me could have a couple of hours of down time- they never truly 'see it', let alone live with it, and when we see each other you can bet it's not on one of those and i'm 'fighting' to put on the best front) given the issues you and the nursing center had with your mom you have to concede that it's no picnic being around her 24/7-unjustifyably wrong of her to lash out at you-but it could have been the result of allot of tensions piling up and you were an easy target.
that said-having read so many posts by your SUPERB hubby (he and mine will have a special place in heaven designated for the wonderful spouses who care for and PROTECT their hubby/wives-the fastest internet connections, sci fi to their hearts content....

) i have to ask you to step back and look at the impact having your mom at home will have on her, you and him. i speak from personal experience when i say that while a spouse can look like he's dealing realy well with the demands of an ill spouse-it can be taking a toll. i was devastated when during a 'good period' in my health to get a call from the primary care doctor dh and share telling me 'i can't reach him by phone, go and get him at work and bring him here NOW". a routine physical showed signs of health issues the doctor had not seen in men twice dh's age-and after considering what dh had dealt with regarding my health issues and some insane family issues, the doctor advised us to 'step back'-and 'let go' of any issues/situations we truly could or accept the fact that it was taking a toll on our health and be prepared to deal with the consequences.
as the only daughter in my family (my brothers range from 6-16 years older than i) i ended up being the 'go to' person for family arguments, issues, 'what are we going to do about mom?'. i finaly said 'we is the operative word-we will figure out what's best for mom and us-and while it may not be mom's first, or our first choice-we have to balance it out against whats best for everyone'. in our case it was an assisted living apartment-she was'nt happy about it, but it was interesting to see that the anger she had about 'proving us wrong' got channeled into doing things she had'nt 'been able' to do before such that she proved us all 'wrong' and was able to drop all of the assisted living and stay on as an independant resident.
i think an interesting and somewhat guilt releiving read may be some of the books written for adult children of aging parents (the 'dummies' series has a great one that talks of what 'we' believe are issues related to our personal history with parents but are actualy a natural progression in shifting from being a child to 'parenting a parent'). i found alot of good information about issues with dealing with my mom as well as some solace that what i was experiencing was not based on some deep seated issue in our past.
take care-and while this has been a wordy post i want to add one more thing-don't be surpised if your mom's eating issues reappear. one thing i learned was that seniors not unlike teens find a tremendous amount of 'control' by virtue of their eating habits-and they can unconsciously use it to manipulate (sadly, i had an elderly aunt that my mom catered to for years to 'get her to eat'-when she got mad and went to live with one of her kids who did'nt cater, it had become an ingraned habit vs. a choice-one of the contributing factors to her death was malnutrition

).
god bless and god speed.
'redheads united will never be defeated"