My sister and I have put my mother who is 77 involuntarily into a mental ward for assessment. Can we apply for guardianship of her husband?

We had to get a lawyer and go to court because it was involuntary and my stepfather, a physician, had refused to get her help. She has cataracts on her eyes, her teeth are falling out, halluncinating, doesn't know who people are, gets lost, etc. We had a family intervention with a therapist and begged him to get her some help. He said yes and then pulled out at the last minute, leaving my sister and I to force the issue with an attorney and the probate judge to put her in the hospital for an assessment. Here's the question, she's been in for 7 days so by law we had to go back to court, it was determined by the doctors at the hospital that she is a paranoid schizoprenic, latter states of alzheimers, thyroid problems(not on meds) and a multitude of untended medical issues. The court extended her stay for another 28 days to try and get her looked after and on some medications. My step-father, married to her for 15 years, wants to take her out. We know that he can't for 28 days, but what happens at the end of the 28 days. If she goes home with him he won't administer the medications and my mother will be back in the same if not worse condition. Can we apply for guardianship if her husband is alive? He is 7 years her junior and physically well.