Here's a nice idea - "a planned intergenerational community", called Treehouse, set up in the US to bring together families with foster children with older adults who can act as de facto grandparents.
The idea was pioneered in 1994 in a former army base by someone called Hope Meadows.
“It seems to have the capacity of working a lot better than a caseworker visiting two times a month,” said Tom Berkshire, a former chief of staff for the Illinois Department of Children and Family Services, who observed Hope Meadows closely. “The issues that foster kids have — this deals with a lot of them. The issue of graduating out of the system at 18, the issue of having role models to follow, the issue of ‘I know where I belong.’ ”