I have one thats about 20yrs old and hasn't been used for about 19yrs. I've wondered lately if I got it out if it would still work. I'm not even sure if I still have the manuals that show how to thread it. I have been considering buying one from my Viking dealer but want one of those auto threaders. I have Nancy Zimmermans book on quilting with a serger and now I'm starting to get back into making clothes and even with my embroidery machine I can see me using it alot more now. This might be the encouragement I need to get it out and see if it'll come back to life.
Good luck with your mom and I hope all goes well. I agree with another, make sure you take sometime while being a good daughter and do something for your self.