Why did Winston flee parents?

doesn't mention
his father; only his younger sister and mother are discussed.  I don't think flee is the best
term in this case.  Winston temporarily leaves his family due to the guilt he feels over
stealing food from his sister.  When he returns, he has been separated (dreams -a tad unclear)
from his relations.  The Party must destroy the familial unit in order to remain
all-powerful.  The Party is responsible for Winston's detachment from his bloodline.