If in relating to the other you feel afraid, it is because the other has the capacity to hurt your interests, that’s all. Why are you so dependent? It might be that you are dependent just in a psychological way, or you might be dependent even in a financial way, or you might be dependent in a social way. But there is some definite dependency, and that dependency is causing your fear. It is the simple threat that something will be badly hit at if you speak the truth.
Then you must honestly think about the nature of your relationship with your family members. Where is love? Where is the truth? But it is not very surprising. This is the way most parent-child relationships are, this is the way most families are constructed: not on the foundation of love and Truth but merely as institutions that exist for society’s sake.