How do I go about becoming or can you advise how I can go about taking over the say or duties of my mothers home?

What a difficult situation! I'm so sorry your mother is going through this. The problems seem to be caused by your mother's husband, not your mother.  You paint a very vivid picture of a dangerous and stressful environment. But you don't explain why your mother puts up with this. Since she still works, I would have to assume she has full mental capacity.  So I would have some questions: (1) How long have they been married? (2) Whose name is the home in? (3) Does the husband work? If no, does he have other income? (4) Is this a fairly new problem, or has it been going on for years, and possibly just gotten worse recently? Does the husband have family? Are they aware of the situation? It sounds like the husband should be removed from the home for your mother's safety and probably his own. But then where would he go? And how would your mother feel about that? I would say that you are at one of the crossovers between family law and estate/trust law. Trying to force your mother to live without plumbing is abusive. Domestic abuse is real, and doesn't stop when people get older. On the other hand, the husband may have dementia, which moves into the estate/trust area, with the possibility of putting him under conservatorship. Could your mother stay in her home without the husband's income? If not, do you have alternate housing ideas she would agree to?