Don't know what to do for the best.

[CoffeeLover90]

I've asked advice from friends and family but I'm worried they're just agreeing with me to spare my feelings.
I've a very long winded previous post about how my ex was abusive and removed by police. I've since got an injunction.
Now this has happened... ex's mother has had lung cancer, it was in remission. Nearly a week ago she told me it has returned and spread. It's now in liver, kidneys and bone. Today her daughter called an ambulance for her, they believed she was having a heart attack but it turns out it is sepsis. She's doing a lot better thankfully.
Now, my problem- ex is living there. I have the injunction. SS say he must only have supervised contact with our DS by a trusted adult and I agree. His mum has always lied for him and cannot be trusted to supervise. He drinks and smokes weed excessively. This morning she messaged me to say she was not happy I'd had his phone cut off. That's because it's in my name and he wouldn't pay for it. I'd told her it had been cancelled. She's asked me to take him back etc even knowing the full extent of what he's done. Her home is filthy. I'm not a snob, it's literally like one of the houses on those cleaning programs. There's 5 adults smoking in the house, I suspect my ex may be keeping up personal hygiene but the others don't even wash their hands. Two of the adults also smoke weed in the house.
His mum may not get to visit our DS here for a while, if at all. This cancer may not be cured and, towards the end, I know she won't be able to visit.
Is it wrong of me to not want to take DS (almost 3) to the house? It's worth mentioning her DD has 3 children, neither of them have ever been to the house and the oldest is 13. I don't know what her plans are if her mum is unable to get out to see them.
Thanks for reading.

You're not unreasonable at all, you're doing what any decent mother would and protecting your child. If you have a SW or practitioner I would speak to them for advice as well, they may be able to make some practical suggestions. You've done the right thing, a sad change in circumstances doesn't change that

I don't have a SW as she closed the case after her visit and checking with nursery etc. She was happy with what I'd done.
It's worth noting that at the very start of this I did ask people to supervise. His sister was one of them. They all said no. His sister wanted to think it over, in the meantime he got drunk and rang her and had a go as she is 'taking my side' so she refused to supervise saying he's not stable. SS know this. I told his mam what he needed to do, even sent her the link to apply for a court order. I suggested he apologise to his sister and keep her updated on how he is progressing (if at all) he's done nothing. His mam says he cares, loves us both, misses DS but actions speak a lot louder than words. She either doesn't realise this or is desperate to get us back together to get him out of her house.
It's sounds heartless but I don't care who's feelings get hurt as long as my son and me remain safe.

You need to protect your child. It's sad that their grandmother is ill but your child, the most important person in this situation, is the one you need to look after. You have supervised contact for a reason and you have valid concerns about taking your child to this house. His mother sounds very manipulative actually, don't be drawn in.

She is, you've hit the nail on the head. Quite a few times she's said he loves you and so on. Or tried to make a joke of things. I'd send her a photo of something I cooked and she'd reply 'EX wants to know where his is'
This is one of the reasons we kept getting back together before, although there was still love there I think.
I'm not falling for it now, I just bat it off. This time I'm actually getting the truth from his sister about his attitude and I don't believe he's even said these things. I think she's just trying to get us back together.
As if I'd choose my son over anyone? Let alone that piece of shit.

It was pointless to write this. She passed away today. It's happened so quickly. I never got to see her and it doesn't seem real at the moment. I won't be going to the funeral, I can't anyway having an injunction against her son (who has every right to he there) I feel so helpless, I couldn't help her or the family in anyway. I can support her daughter as she's the only normal one among them. The woman was a lot of things but at times she was there for me and treat me as her own. No one deserves to suffer and I'm glad she didn't for long. Thank you for putting my mind at rest that I was doing the right thing. Manipulation can make you doubt yourself even when you KNOW your right.