My Dad is 87 and has Mixed Dementia (Vascular and Altzheimers) diagnosed March 2022. He is going down hill fast - just off to do his dinner for him.
Mam also 87 has had Vascular for 9 years and is in the same Nursing Home bed she has been for over 6 years. She doesn't know me, hasn't since Covid period, which was horrendous. Both Dad and I wish she would gently pass, but on she goes.
Watching Dad go down a similar path is very upsetting.
I don't think there is much you can do but crack on. There is no upside to dementia, they are never getting better, only worse. I just try and make their time the best it can be in the circumstances.
My heart goes out to you Laughing - and everybody else impacted.
It is a cruel condition and casts its net far and wide.
Good Luck fella.