Joy, ouch, now thats a problem I have not had to face. On top of worrying about your Moms health you have this new husband.  Barbara had great advice, make sure Elder Care lawyer they know more about laws that affect the aging public.  Maybe a private detective to check out the new husband.  Have you googled him you might find other people who know him, exwife??  I totally understand your concern and I would do all of the above.  best of luck