I am writing a book that involves a character whose parents lived in
China during the great famine. The character is born
shortly after the famine, and his mother dies shortly afterwards. His
uncle takes the young child with him and escapes to Hong Kong. They
eventually find their way to the USA.
In 1990 the uncle and his nephew go back to China to trace the nephew's roots.

I'd like to know:
1) How the masses were buried during the time of the famine (1960). I
imagine mass graves. Were they/ are they marked?
2) Is it feasible that the uncle and nephew could have gone to visit
one of these mass graves in 1990?
3) How would a contemprorary Chinese family bury their dead in the US,
specifically in New York. Are there particular traditions that remain,
perhaps been westernised? i'm looking for info on a modern Chinese
family, well educated, second generation, well integrated into the
American life with no family ties in China.

The answers can be brief, i need to know broad facts.