SFUSD only busses kids with special needs. Everybody else has to get to school on their own.
Siblings get preference for the same school, so it's pretty unlikely they'd be on different sides of town.
SFUSD has tons of problems but you are not accurate in your description of what they are.
The real problem is that the kids of parents who can't drive them to school end up having to go to a local school anyway, so the egalitarian idea of having kids go to any school did not actually work out as a positive for anybody but kids who were already privileged enough to have someone drive them to school.
Siblings get preference for the same school, so it's pretty unlikely they'd be on different sides of town.
SFUSD has tons of problems but you are not accurate in your description of what they are.
The real problem is that the kids of parents who can't drive them to school end up having to go to a local school anyway, so the egalitarian idea of having kids go to any school did not actually work out as a positive for anybody but kids who were already privileged enough to have someone drive them to school.