Thanks for your earlier response but I'm not concerned for my physical safety. My concern is that my 85yo partner has

Customer: Thanks for your earlier response but I'm not concerned for my physical safety. My concern is that my 85yo partner has been diagnosed with alzhiemers and early signs of dementia and i fear i'll lose my home if and/or when she can no longer be cared for at home.
We've been together ~15yrs, and~6yrs ago moved to share a house with her adult son, who lives in the front part of a large house in which i rent a room. i also have access to a large double garage in which I've conducted experiments associated with a long-term research project that I consider to be of truly global significance.
I'm 79 and my partner and I no longer have a physical relationship but I've been her designated carer for ~5 years, as she also has Macular degeneration and Parkinsons.
Arthur, Irenas son has been working from home during Covid and has pointedly taken over most of what i saw as my responsibilities and duties as her carer, although she is still able to mostly care for herself. We also have home help 3 days a week.
I need advice on my rights, as Arthur has become increasing non-comunicative and petulant and has indicated he wants to sell up as soon as his mother can no longer be cared for at home.
Irena and I still have a caring relationship but, having been married twice b4, I've resisted marriage with her despite her asking me to, on repeated occasions.
Although my general health is now good, I've had major problems in the past with arthritis and other health issues and am still only able to stand unaided for 2-3 minutes, and I mainly get around on a mobility scooter.
I hope this gives you an better idea of my issues and hope you can advise on my best approach. I'm entirely dependent on my pension but have managed to save ~10k. I would like, if possible, to stay in the home. I understand that, when she dies, Irena wants me to have all the money she has saved from my rent over time we've been together but have so far refused discuss the matter with her, as I didnt want to seem to be challenging Arthur's inheritance. In the past Arthur had said he'd look after me but that situation has clearly changed. Any advice?
I do have a son ~60km away, but he is unable to help