Remember that the article is not needed with posessives used in connection with "singular" members of the family, example:
MIA madre ha molti amici
My mother has many friends
MIO fratello legge molto
My brother reads a lot
BUTLA mia zia di Capri ha una bellissima casa
My aunt from Capri ha a beautiful house
In the above sentence the article (LA) is required because we are adding more information about the person concerned: we are qualifying MIA ZIA by saying that she is from Capri (DI CAPRI).
Other example:
MIA SORELLA ama la musica classica
My sister loves classical music
BUT
LA MIA sorella maggiore è in Spagna
My eldest sister is in Spain
Again, we are qualifying the word
sorella with the word
maggiore, and for that reason the article is required