Well, at least in Europe, you find even youngsters, who are doing such.
From the United Kingdom (just because it's the news today):
Hidden army of young carers
This is, IMHO, however another theme than the originally thread.
There, everything was planned as it should be:
a handicapted, living for his own (and not in a home), in the middle of the city (the place where he lived was in a cul-de-sac in the center of Hanburg), well looked after ... .
I don't think you could know in advance that all this would lead to a murder!