Who is the last tombstone in the burning years?

The Burning Years of Love is a romantic movie, directed by edward zwick and starring Anthony Hopkins and Brad Pitt. Epic plot, intoxicating music, wonderful performances and vivid photography are perfectly integrated in this film, creating an eternal classic.

Burning years, the last tombstone at the end, I feel: eldest, third, father, mother, Susan, Xiao Yi and so on. For reference only.