Meanwhile -- or , rather , a short time later , since the overlapping and sequential chapters of the movie are presented as if they were happening simultaneously -- Richard and Susan 's surviving children -LRB- Elle Fanning and Nathan Gamble -RRB- travel to Mexico with the family 's housekeeper , Amelia -LRB- Adriana Barraza -RRB- , whose son is getting married near Tijuana .