I think you'd have to be awfully closely associated with that household for that to work. As a widower I have to say that I really would not have wanted an outsider suddenly appearing and deciding what I needed help with when my wife died.
Perhaps it would work if there were very clear signs that the bereaved were unable to cope.
You even have to be careful with bringing meals. When we lost a family member and all kinds of food started showing up, it was very sweet of people. But it became just one more hassle to deal with at a time when we already had too much to deal with.