What is the genre of PG rated movie starred by the actor with highest net worth?
PG rated refers to MPAA Rating = 'PG';  highest net worth refers to max(NetWorth)
SELECT T1.Genre FROM movie AS T1 INNER JOIN characters AS T2 ON T1.MovieID = T2.MovieID INNER JOIN actor AS T3 ON T3.ActorID = T2.ActorID WHERE T1.`MPAA Rating` = 'PG' ORDER BY CAST(REPLACE(REPLACE(T3.NetWorth, ',', ''), '$', '') AS REAL) DESC LIMIT 1