Did you like the 2001 Anne Hathaway, Julie Andrews film Princess Diaries? It is a favorite of the DrsC. It features one of those mostly white San Francisco private schools mentioned in the previous post.
I bet you never asked yourself how Mia Thermopolis and her far-from-famous artist-mother could afford a private school. Not to mention a roomy-but-funky studio/home in one of the most expensive real estate markets in the nation.
The short answer, one supposes, is that the Renaldis paid serious child support, while for years neglecting their parental visitation rights. It is, after all, a modern fairy tale and as such need not be realistic.