Very likely it is true. From her father's influence, some of her nicer friendlier feelings are often buried and she seldom shows them, only the less friendly sorts of emotions and feelings were pushed and encouraged by her father. Over time this may lessen but since she spend the first however many years with her father's influence before she met her present friends this will likely always be a part of her, including some bits of her father's feelings like speciest, though some may lesson over time. Her mother may have felt much the same as her father did, though we never saw her personality so can't say for sure.
Her little sister will likely not be molded like that since from the start she has the influence of others besides just her father.