Bonjour
Choisir le pronom sujet
Lucas is talking to both his grandparents about his favorite book.
Lucas parle à ses deux grands parents de son livre préféré.
Il leur en parle.
Lucas (il) use the pronom sujet "vous" to talk to both his grandparents about his favorite book.
I'm not sure what was really the question ...
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hope this helps ☺☺☺
please ask in comment if necessary