It's the economy of the family unit.
It's USUALLY the woman who earns less.
It's USUALLY the woman feels she OUGHT to do the caring.
It's USUALLY the man who expects that his wife will do it.
So, no one thing, but all of the tendencies. The perfect shit storm of lower pay, social conditioning, guilt, women being devalued by society as they age.
I know in my family, I will be seen as heartless for not jeopardising my job but my brother will not be seen as heartless for not stepping away from his job. Because his job is so much more important than mine. He earns more certainly. But I value my job.
I'm aware that when the time comes, it's going to be hard to withstand the pressures.
Also, I have actually done a stint in a nursing home. I have cared for my children. I'm probably better suited to caring. It will be hard.
And I'm not unusual. These families dynamics are not unusual.