Help with home repairs for my aging mother who has limited funds?

Yes, my mother still has her cat. Which likely isn’t going to be with us much longer. We’re talking to her about putting the cat down as she is likely in renal failure. It’s a heartbreaking discussion to have with her, especially coming up on the one year anniversary of my fathers passing. The cat is 13 years old and had been the only other thing she’s had during my dad’s passing. But it’s a discussion we have to have. Aside from that, the bind that I’m in is that my husband is appalled at the smell in her home. He says it’s unsanitary and I’m letting her live like this. I am the only child and I feel that I’m doing the best I can. And while I know he genuinely has a good heart and only cares about my mother, he’s taking it very personally that I haven’t done anything about all this yet. The outside of her home needs some repairs to gutters and trim and needs some landscaping redone. These are all things we agreed we have the means (for the most part) to help with, especially with the help of some neighbors. Her bathroom needs work. She’s going to need a new tub and probably some drywall done in there as well. We know a few people that could possibly help, and I told him we could probably get her a cheap tub/shower at the local Habitat Re-Store. However, the carpeting is making him very upset. I honestly can’t pinpoint that it is her carpeting. He says it’s on her carpeting and on everything. I too said the same thing, if it’s on everything like you truly say it is... who is going to be able to come through and help with this then? His response is that I’m not looking into this enough and that there “MUST” be help out there. My dad was a Vietnam Vet (double Purple Heart Recipient), but refused to take any assistance... EVER. But I don’t know if that would benefit my mom at this point or not. I see there is a Habitat for Humanity Repair Corps, but it says the veteran must be living in the home and that it would be a zero percent interest loan. Which would mean she would have to pay it back... and her budget is already extremely tight as it is. Of course I’m seeing online that “low income” for seniors is $30,000. But she makes JUST above that with SSI and pension. I don’t know what to do or who to call... but I guess I can start with Aging. My husband is convinced that if I call Aging... they’ll come out... take one whiff of the place and say it’s unsanitary and she needs to get out. My husband grew up in a nice home in a pretty development. I grew up in a one story rancher where my father chain smoked. His idea of what is “sanitary” is very different than mine. I walk in there and say, “Wow... I think we need to wipe down some walls, shampoo her rugs, open the windows and light a few candles.” His thought is... the cat is urinating on the carpets and furniture... it’s soaked through everything... and there’s no way we can fix this on our own. My thought on why it smells so bad is that there is a chair... a heavy lift chair... that’s sitting in their living room. This chair is the one my dad was sitting on last year and had several “accidents” on and we had to get him cleaned up and spray down the chair and do all that. I’ve been telling my husband it’s filling the home with an awful odor and we need to get it out. And while he keeps saying he needs to find someone to help move it... he maintains that it’s the cat making accidents in the home. Even though we’ve never once actually witnessed the cat urinate on the floor. I smell the chair and I can smell the odor... he says he can’t. So it’s a very opinionated topic and it’s causing a LOT of stress between us. Even my MIL tells me... just tell him to get the chair out. And I do... but it never happens and then here we sit. I told him maybe my nose is broke... but I smell nothing on the carpets or the furniture. Just that dumb chair!