The last time Andy visited his grandmother

[Bassim]

Are my sentences grammatically correct?

The last time Andy visited his grandmother, she revealed her secret. When she was a teenager, she had a son who later died of illness. His father was a man his grandmother was in love with but never married because of her family's opposition.

 

[Charlie Bernstein]

It's good. The phrase "died of illness" is a little strange. More likely:

- died.
- died of an illness.
- got sick and died.
- took ill and died.