So to be consistent, surely the closest families should get priority, regardless of other considerations such as siblings?
What most worries me is that good teachers will naturally want good schools for their children and rather than relying on the same criteria as every other parent, they will get a job in one of the best schools, leaving the poorer performing schools finding it harder to recruit the best teachers.
Sorry to be the bearer of bad news, Michael, but this is absolutely the position at present and indeed has been so for many years already, though I would contend this is far from being the prime cause of difficulty in recruiting teachers in poorer performing schools.