Which is why there is a replacement waiting to be submitted already, namely Tinhampton's "Employee Rights".
I'd say the text of the law currently in place is clear. It speaks of the worker who has "to care for", and as that care may reasonably encompass several years (think of an illness where patients live for years in a state where they can't independently see to their own needs), that worker will have to take care for that patient for those years, as per the text of the law. If the law wanted to specify other situations, it should have said so, but in its current form the law does as the law says.
The fact that you interpret "care for" differently proves, in my opinion, the flaws of GAR #527 that I address in the repeal, namely "vacuums of subjective interpretation", which undermine "Protected Working Leave".