Sorry @whyamiawakestill but I am also awake when I don't want to be, so I may not sound as sympathetic to your predicament as both you and I would like me to be. But before going any further, how come you and I seem to have the same brother? Mine also lives overseas and has been very selfish when dealing with our parents, and he also didn't come to our Dad's funeral. Like me, you should have probably been born circa the beginning of the 2nd World War, or even earlier!
Families these days are very different to how they used to be. I believe that for about the last 50 years there has been an unprecedented speed of change in the ways families live, interact, and view each other. I think that I would be fascinated if I could research all the reasons for such a massive change in circumstances, and it would probably take an indepth thesis for me to cover most of those reasons. So very, and inadequately quickly, I will just jot down what I consider to be the main and most easily seen reasons:
The dawn of modern day transport. Planes, trains, and automobiles. Diesel and then also electrically powered ones.
The relative ability and cheapness to travel very long distances away from home.
A much improved and extended education system - although some people may disagree with that statement. My father left school when he was 14 in the 1930s, even though he was highly intelligent.
The start of the welfare state.
The rapid advance in communication systems. Private telephones in every home started to rapidly increase in the late 1950s and the 1960s.
The rapid advance in technology, including the dawning of the age of computers, which quickly led to the birth of personal computers, and then the internet.
During the advance of technology, televisions became common place. Which led to documentaries and news programs which actually showed us life in countries far, far away from our own small villages and towns. Which then lured millions of people to experience life in some very different climates and cultures.
The downturn in some religious beliefs probably also had quite a profound affect and effect.
Whereas the rapid expansion of some other (other than the Protestant and Roman Catholic beliefs in Great Britain) religions in the UK will have presumably had a significant affect/effect on the changes in behaviour of our nuclear families.
Obviously, I am only, and very simply, grazing the surface of the enormous changes that have happened in the UK - and the rest of the World really - in the last 50 or so years.
So, to the point of my post 🙄🙈! I just wanted to say, please don't help or encourage your DM to buy her own house at the age of 80 years old. Apart from being responsible for any ongoing maintenance of the property, if it is bought in an assisted living complex, once she sadly dies, the property would need to be sold again, almost certainly along with a 'penalty' that has to be paid back to the management company. Also, very unfairly, your brother might be able to claim half of any profit made through the sale of the property...
You are a lovely DD for your DM, but I'm afraid I think you are being very naive, and not thinking straight at all. But please except a big hug from me, and some 💐