temporal logic with antes de que

[Nfqufktc]

¡Hola!
I would appreciate it if you could check my understanding with regard to the temporal sequence of the actions in the past in the following sentences with the adverbial expression antes de que:

Please find the above-mentioned sentences for copying/pasting:
1. Antes de que la reunión terminara, Marta y Luisa se fueron.
Marta y Luisa left before the meeting ended.
2. Su madre murió antes de que él hubiese cumplido los dos años.
His mother died before he had been two.
3. (José dijo que) su madre murió antes de que él hubiese cumplido los dos años.
(Joseph said that) his mother (had) died before he had been two.

Thank you.